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Finding the Fourth Proportional to 85,500.70, 128,251.05 and 54,007.90

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Solution

The fourth proportional to 85,500.70, 128,251.05 and 54,007.90 is: 81,011.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,500.70 : 128,251.05 = 54,007.90 : x
  2. Step 2: Convert to fraction form
    85,500.70/128,251.05 = 54,007.90/x
  3. Step 3: Cross multiply
    85,500.70x = 128,251.05 × 54,007.90
  4. Step 4: Simplify right side
    85,500.70x = 6,926,569,883.30
  5. Step 5: Solve for x
    x = 6,926,569,883.30/85,500.70
  6. Step 6: Final answer
    x = 81,011.85

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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.