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Finding the Fourth Proportional to 138,697.56, 207,921.51 and 49,888.71

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Solution

The fourth proportional to 138,697.56, 207,921.51 and 49,888.71 is: 74,788.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,697.56 : 207,921.51 = 49,888.71 : x
  2. Step 2: Convert to fraction form
    138,697.56/207,921.51 = 49,888.71/x
  3. Step 3: Cross multiply
    138,697.56x = 207,921.51 × 49,888.71
  4. Step 4: Simplify right side
    138,697.56x = 10,372,935,915.15
  5. Step 5: Solve for x
    x = 10,372,935,915.15/138,697.56
  6. Step 6: Final answer
    x = 74,788.16

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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.