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Finding the Fourth Proportional to 83.53, 115.32 and 61.66

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Solution

The fourth proportional to 83.53, 115.32 and 61.66 is: 85.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.53 : 115.32 = 61.66 : x
  2. Step 2: Convert to fraction form
    83.53/115.32 = 61.66/x
  3. Step 3: Cross multiply
    83.53x = 115.32 × 61.66
  4. Step 4: Simplify right side
    83.53x = 7,111.01
  5. Step 5: Solve for x
    x = 7,111.01/83.53
  6. Step 6: Final answer
    x = 85.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.