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Finding the Fourth Proportional to 87.29, 130.66 and 56.40

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Solution

The fourth proportional to 87.29, 130.66 and 56.40 is: 84.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.29 : 130.66 = 56.40 : x
  2. Step 2: Convert to fraction form
    87.29/130.66 = 56.40/x
  3. Step 3: Cross multiply
    87.29x = 130.66 × 56.40
  4. Step 4: Simplify right side
    87.29x = 7,369.22
  5. Step 5: Solve for x
    x = 7,369.22/87.29
  6. Step 6: Final answer
    x = 84.42

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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.