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Finding the Fourth Proportional to 83.69, 115.41 and 62.90

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Solution

The fourth proportional to 83.69, 115.41 and 62.90 is: 86.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.69 : 115.41 = 62.90 : x
  2. Step 2: Convert to fraction form
    83.69/115.41 = 62.90/x
  3. Step 3: Cross multiply
    83.69x = 115.41 × 62.90
  4. Step 4: Simplify right side
    83.69x = 7,259.29
  5. Step 5: Solve for x
    x = 7,259.29/83.69
  6. Step 6: Final answer
    x = 86.74

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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.