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Finding the Fourth Proportional to 61.54, 84.91 and 39.69

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Solution

The fourth proportional to 61.54, 84.91 and 39.69 is: 54.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.54 : 84.91 = 39.69 : x
  2. Step 2: Convert to fraction form
    61.54/84.91 = 39.69/x
  3. Step 3: Cross multiply
    61.54x = 84.91 × 39.69
  4. Step 4: Simplify right side
    61.54x = 3,370.08
  5. Step 5: Solve for x
    x = 3,370.08/61.54
  6. Step 6: Final answer
    x = 54.76

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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.