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Finding the Fourth Proportional to 91,502.91, 136,911.84 and 86,697.12

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Solution

The fourth proportional to 91,502.91, 136,911.84 and 86,697.12 is: 129,721.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,502.91 : 136,911.84 = 86,697.12 : x
  2. Step 2: Convert to fraction form
    91,502.91/136,911.84 = 86,697.12/x
  3. Step 3: Cross multiply
    91,502.91x = 136,911.84 × 86,697.12
  4. Step 4: Simplify right side
    91,502.91x = 11,869,862,221.90
  5. Step 5: Solve for x
    x = 11,869,862,221.90/91,502.91
  6. Step 6: Final answer
    x = 129,721.14

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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.