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Finding the Fourth Proportional to 86.75, 129.90 and 56.27

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Solution

The fourth proportional to 86.75, 129.90 and 56.27 is: 84.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.75 : 129.90 = 56.27 : x
  2. Step 2: Convert to fraction form
    86.75/129.90 = 56.27/x
  3. Step 3: Cross multiply
    86.75x = 129.90 × 56.27
  4. Step 4: Simplify right side
    86.75x = 7,308.87
  5. Step 5: Solve for x
    x = 7,308.87/86.75
  6. Step 6: Final answer
    x = 84.26

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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.