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Finding the Fourth Proportional to 87.13, 130.79 and 56.32

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Solution

The fourth proportional to 87.13, 130.79 and 56.32 is: 84.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.13 : 130.79 = 56.32 : x
  2. Step 2: Convert to fraction form
    87.13/130.79 = 56.32/x
  3. Step 3: Cross multiply
    87.13x = 130.79 × 56.32
  4. Step 4: Simplify right side
    87.13x = 7,366.42
  5. Step 5: Solve for x
    x = 7,366.42/87.13
  6. Step 6: Final answer
    x = 84.54

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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.