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Finding the Fourth Proportional to 86.85, 130.13 and 52.53

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Solution

The fourth proportional to 86.85, 130.13 and 52.53 is: 78.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.85 : 130.13 = 52.53 : x
  2. Step 2: Convert to fraction form
    86.85/130.13 = 52.53/x
  3. Step 3: Cross multiply
    86.85x = 130.13 × 52.53
  4. Step 4: Simplify right side
    86.85x = 6,835.47
  5. Step 5: Solve for x
    x = 6,835.47/86.85
  6. Step 6: Final answer
    x = 78.70

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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.