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Finding the Fourth Proportional to 87,219.20, 130,742.40 and 40,390.40

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Solution

The fourth proportional to 87,219.20, 130,742.40 and 40,390.40 is: 60,545.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,219.20 : 130,742.40 = 40,390.40 : x
  2. Step 2: Convert to fraction form
    87,219.20/130,742.40 = 40,390.40/x
  3. Step 3: Cross multiply
    87,219.20x = 130,742.40 × 40,390.40
  4. Step 4: Simplify right side
    87,219.20x = 5,280,737,832.96
  5. Step 5: Solve for x
    x = 5,280,737,832.96/87,219.20
  6. Step 6: Final answer
    x = 60,545.59

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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.