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Finding the Fourth Proportional to 90,882.92, 136,112.76 and 87,730

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Solution

The fourth proportional to 90,882.92, 136,112.76 and 87,730 is: 131,390.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,882.92 : 136,112.76 = 87,730 : x
  2. Step 2: Convert to fraction form
    90,882.92/136,112.76 = 87,730/x
  3. Step 3: Cross multiply
    90,882.92x = 136,112.76 × 87,730
  4. Step 4: Simplify right side
    90,882.92x = 11,941,172,434.80
  5. Step 5: Solve for x
    x = 11,941,172,434.80/90,882.92
  6. Step 6: Final answer
    x = 131,390.72

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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.