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Finding the Fourth Proportional to 83.69, 115.51 and 52.61

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Solution

The fourth proportional to 83.69, 115.51 and 52.61 is: 72.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.69 : 115.51 = 52.61 : x
  2. Step 2: Convert to fraction form
    83.69/115.51 = 52.61/x
  3. Step 3: Cross multiply
    83.69x = 115.51 × 52.61
  4. Step 4: Simplify right side
    83.69x = 6,077.14
  5. Step 5: Solve for x
    x = 6,077.14/83.69
  6. Step 6: Final answer
    x = 72.62

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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.