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Finding the Fourth Proportional to 86.59, 129.90 and 38.53

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Solution

The fourth proportional to 86.59, 129.90 and 38.53 is: 57.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.59 : 129.90 = 38.53 : x
  2. Step 2: Convert to fraction form
    86.59/129.90 = 38.53/x
  3. Step 3: Cross multiply
    86.59x = 129.90 × 38.53
  4. Step 4: Simplify right side
    86.59x = 5,004.40
  5. Step 5: Solve for x
    x = 5,004.40/86.59
  6. Step 6: Final answer
    x = 57.80

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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.