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Finding the Fourth Proportional to 90,691.70, 136,037.55 and 89,816.90

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Solution

The fourth proportional to 90,691.70, 136,037.55 and 89,816.90 is: 134,725.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,691.70 : 136,037.55 = 89,816.90 : x
  2. Step 2: Convert to fraction form
    90,691.70/136,037.55 = 89,816.90/x
  3. Step 3: Cross multiply
    90,691.70x = 136,037.55 × 89,816.90
  4. Step 4: Simplify right side
    90,691.70x = 12,218,471,024.60
  5. Step 5: Solve for x
    x = 12,218,471,024.60/90,691.70
  6. Step 6: Final answer
    x = 134,725.35

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1.5x scale

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.