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Finding the Fourth Proportional to 644,612.20, 966,918.30 and 420,663.40

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Solution

The fourth proportional to 644,612.20, 966,918.30 and 420,663.40 is: 630,995.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,612.20 : 966,918.30 = 420,663.40 : x
  2. Step 2: Convert to fraction form
    644,612.20/966,918.30 = 420,663.40/x
  3. Step 3: Cross multiply
    644,612.20x = 966,918.30 × 420,663.40
  4. Step 4: Simplify right side
    644,612.20x = 406,747,139,600.22
  5. Step 5: Solve for x
    x = 406,747,139,600.22/644,612.20
  6. Step 6: Final answer
    x = 630,995.10

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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.