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Finding the Fourth Proportional to 61.44, 84.90 and 59.28

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Solution

The fourth proportional to 61.44, 84.90 and 59.28 is: 81.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.44 : 84.90 = 59.28 : x
  2. Step 2: Convert to fraction form
    61.44/84.90 = 59.28/x
  3. Step 3: Cross multiply
    61.44x = 84.90 × 59.28
  4. Step 4: Simplify right side
    61.44x = 5,032.87
  5. Step 5: Solve for x
    x = 5,032.87/61.44
  6. Step 6: Final answer
    x = 81.92

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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.