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Finding the Fourth Proportional to 61.28, 84.51 and 40.53

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Solution

The fourth proportional to 61.28, 84.51 and 40.53 is: 55.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.28 : 84.51 = 40.53 : x
  2. Step 2: Convert to fraction form
    61.28/84.51 = 40.53/x
  3. Step 3: Cross multiply
    61.28x = 84.51 × 40.53
  4. Step 4: Simplify right side
    61.28x = 3,425.19
  5. Step 5: Solve for x
    x = 3,425.19/61.28
  6. Step 6: Final answer
    x = 55.90

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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.