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Finding the Fourth Proportional to 138,410.81, 191,006.92 and 74,748.61

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Solution

The fourth proportional to 138,410.81, 191,006.92 and 74,748.61 is: 103,153.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,410.81 : 191,006.92 = 74,748.61 : x
  2. Step 2: Convert to fraction form
    138,410.81/191,006.92 = 74,748.61/x
  3. Step 3: Cross multiply
    138,410.81x = 191,006.92 × 74,748.61
  4. Step 4: Simplify right side
    138,410.81x = 14,277,501,770.38
  5. Step 5: Solve for x
    x = 14,277,501,770.38/138,410.81
  6. Step 6: Final answer
    x = 103,153.08

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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.