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Finding the Fourth Proportional to 138,349.10, 207,718.05 and 85,861.10

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Solution

The fourth proportional to 138,349.10, 207,718.05 and 85,861.10 is: 128,912.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,349.10 : 207,718.05 = 85,861.10 : x
  2. Step 2: Convert to fraction form
    138,349.10/207,718.05 = 85,861.10/x
  3. Step 3: Cross multiply
    138,349.10x = 207,718.05 × 85,861.10
  4. Step 4: Simplify right side
    138,349.10x = 17,834,900,262.86
  5. Step 5: Solve for x
    x = 17,834,900,262.86/138,349.10
  6. Step 6: Final answer
    x = 128,912.30

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