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Finding the Fourth Proportional to 86.52, 129.60 and 79.53

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Solution

The fourth proportional to 86.52, 129.60 and 79.53 is: 119.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.52 : 129.60 = 79.53 : x
  2. Step 2: Convert to fraction form
    86.52/129.60 = 79.53/x
  3. Step 3: Cross multiply
    86.52x = 129.60 × 79.53
  4. Step 4: Simplify right side
    86.52x = 10,307.09
  5. Step 5: Solve for x
    x = 10,307.09/86.52
  6. Step 6: Final answer
    x = 119.13

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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.