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Finding the Fourth Proportional to 87,590.70, 131,418.45 and 28,428.30

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Solution

The fourth proportional to 87,590.70, 131,418.45 and 28,428.30 is: 42,652.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,590.70 : 131,418.45 = 28,428.30 : x
  2. Step 2: Convert to fraction form
    87,590.70/131,418.45 = 28,428.30/x
  3. Step 3: Cross multiply
    87,590.70x = 131,418.45 × 28,428.30
  4. Step 4: Simplify right side
    87,590.70x = 3,736,003,122.14
  5. Step 5: Solve for x
    x = 3,736,003,122.14/87,590.70
  6. Step 6: Final answer
    x = 42,652.97

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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.