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Finding the Fourth Proportional to 61.28, 84.53 and 39.16

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Solution

The fourth proportional to 61.28, 84.53 and 39.16 is: 54.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.28 : 84.53 = 39.16 : x
  2. Step 2: Convert to fraction form
    61.28/84.53 = 39.16/x
  3. Step 3: Cross multiply
    61.28x = 84.53 × 39.16
  4. Step 4: Simplify right side
    61.28x = 3,309.58
  5. Step 5: Solve for x
    x = 3,309.58/61.28
  6. Step 6: Final answer
    x = 54.01

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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.