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Finding the Fourth Proportional to 644,126.80, 966,190.20 and 407,736.40

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Solution

The fourth proportional to 644,126.80, 966,190.20 and 407,736.40 is: 611,604.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,126.80 : 966,190.20 = 407,736.40 : x
  2. Step 2: Convert to fraction form
    644,126.80/966,190.20 = 407,736.40/x
  3. Step 3: Cross multiply
    644,126.80x = 966,190.20 × 407,736.40
  4. Step 4: Simplify right side
    644,126.80x = 393,950,913,863.28
  5. Step 5: Solve for x
    x = 393,950,913,863.28/644,126.80
  6. Step 6: Final answer
    x = 611,604.60

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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.