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Finding the Fourth Proportional to 681,436.76, 940,402.16 and 379,650.20

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Solution

The fourth proportional to 681,436.76, 940,402.16 and 379,650.20 is: 523,928.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,436.76 : 940,402.16 = 379,650.20 : x
  2. Step 2: Convert to fraction form
    681,436.76/940,402.16 = 379,650.20/x
  3. Step 3: Cross multiply
    681,436.76x = 940,402.16 × 379,650.20
  4. Step 4: Simplify right side
    681,436.76x = 357,023,868,124.43
  5. Step 5: Solve for x
    x = 357,023,868,124.43/681,436.76
  6. Step 6: Final answer
    x = 523,928.10

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.