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Finding the Fourth Proportional to 61.45, 84.91 and 52.74

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Solution

The fourth proportional to 61.45, 84.91 and 52.74 is: 72.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.45 : 84.91 = 52.74 : x
  2. Step 2: Convert to fraction form
    61.45/84.91 = 52.74/x
  3. Step 3: Cross multiply
    61.45x = 84.91 × 52.74
  4. Step 4: Simplify right side
    61.45x = 4,478.15
  5. Step 5: Solve for x
    x = 4,478.15/61.45
  6. Step 6: Final answer
    x = 72.87

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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.