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Finding the Fourth Proportional to 61.18, 91.35 and 52.61

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Solution

The fourth proportional to 61.18, 91.35 and 52.61 is: 78.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.18 : 91.35 = 52.61 : x
  2. Step 2: Convert to fraction form
    61.18/91.35 = 52.61/x
  3. Step 3: Cross multiply
    61.18x = 91.35 × 52.61
  4. Step 4: Simplify right side
    61.18x = 4,805.47
  5. Step 5: Solve for x
    x = 4,805.47/61.18
  6. Step 6: Final answer
    x = 78.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.