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Finding the Fourth Proportional to 91,989.59, 138,037.92 and 38,677.70

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Solution

The fourth proportional to 91,989.59, 138,037.92 and 38,677.70 is: 58,039.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,989.59 : 138,037.92 = 38,677.70 : x
  2. Step 2: Convert to fraction form
    91,989.59/138,037.92 = 38,677.70/x
  3. Step 3: Cross multiply
    91,989.59x = 138,037.92 × 38,677.70
  4. Step 4: Simplify right side
    91,989.59x = 5,338,989,431.24
  5. Step 5: Solve for x
    x = 5,338,989,431.24/91,989.59
  6. Step 6: Final answer
    x = 58,039.06

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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.