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Finding the Fourth Proportional to 66,488.70, 99,683.45 and 40,187.90

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Solution

The fourth proportional to 66,488.70, 99,683.45 and 40,187.90 is: 60,251.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,488.70 : 99,683.45 = 40,187.90 : x
  2. Step 2: Convert to fraction form
    66,488.70/99,683.45 = 40,187.90/x
  3. Step 3: Cross multiply
    66,488.70x = 99,683.45 × 40,187.90
  4. Step 4: Simplify right side
    66,488.70x = 4,006,068,520.26
  5. Step 5: Solve for x
    x = 4,006,068,520.26/66,488.70
  6. Step 6: Final answer
    x = 60,251.87

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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.