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Finding the Fourth Proportional to 138,333.20, 207,499.80 and 85,845.20

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Solution

The fourth proportional to 138,333.20, 207,499.80 and 85,845.20 is: 128,767.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,333.20 : 207,499.80 = 85,845.20 : x
  2. Step 2: Convert to fraction form
    138,333.20/207,499.80 = 85,845.20/x
  3. Step 3: Cross multiply
    138,333.20x = 207,499.80 × 85,845.20
  4. Step 4: Simplify right side
    138,333.20x = 17,812,861,830.96
  5. Step 5: Solve for x
    x = 17,812,861,830.96/138,333.20
  6. Step 6: Final answer
    x = 128,767.80

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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.