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Finding the Fourth Proportional to 644,087.40, 966,131.10 and 406,660.20

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Solution

The fourth proportional to 644,087.40, 966,131.10 and 406,660.20 is: 609,990.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,087.40 : 966,131.10 = 406,660.20 : x
  2. Step 2: Convert to fraction form
    644,087.40/966,131.10 = 406,660.20/x
  3. Step 3: Cross multiply
    644,087.40x = 966,131.10 × 406,660.20
  4. Step 4: Simplify right side
    644,087.40x = 392,887,066,352.22
  5. Step 5: Solve for x
    x = 392,887,066,352.22/644,087.40
  6. Step 6: Final answer
    x = 609,990.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.