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Finding the Fourth Proportional to 87.20, 130.80 and 46.62

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Solution

The fourth proportional to 87.20, 130.80 and 46.62 is: 69.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.20 : 130.80 = 46.62 : x
  2. Step 2: Convert to fraction form
    87.20/130.80 = 46.62/x
  3. Step 3: Cross multiply
    87.20x = 130.80 × 46.62
  4. Step 4: Simplify right side
    87.20x = 6,097.90
  5. Step 5: Solve for x
    x = 6,097.90/87.20
  6. Step 6: Final answer
    x = 69.93

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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.