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Finding the Fourth Proportional to 61.47, 84.84 and 39.64

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Solution

The fourth proportional to 61.47, 84.84 and 39.64 is: 54.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.47 : 84.84 = 39.64 : x
  2. Step 2: Convert to fraction form
    61.47/84.84 = 39.64/x
  3. Step 3: Cross multiply
    61.47x = 84.84 × 39.64
  4. Step 4: Simplify right side
    61.47x = 3,363.06
  5. Step 5: Solve for x
    x = 3,363.06/61.47
  6. Step 6: Final answer
    x = 54.71

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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.