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Finding the Fourth Proportional to 61.44, 84.28 and 57.76

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Solution

The fourth proportional to 61.44, 84.28 and 57.76 is: 79.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.44 : 84.28 = 57.76 : x
  2. Step 2: Convert to fraction form
    61.44/84.28 = 57.76/x
  3. Step 3: Cross multiply
    61.44x = 84.28 × 57.76
  4. Step 4: Simplify right side
    61.44x = 4,868.01
  5. Step 5: Solve for x
    x = 4,868.01/61.44
  6. Step 6: Final answer
    x = 79.23

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.