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Finding the Fourth Proportional to 61.56, 92.88 and 57.78

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Solution

The fourth proportional to 61.56, 92.88 and 57.78 is: 87.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.56 : 92.88 = 57.78 : x
  2. Step 2: Convert to fraction form
    61.56/92.88 = 57.78/x
  3. Step 3: Cross multiply
    61.56x = 92.88 × 57.78
  4. Step 4: Simplify right side
    61.56x = 5,366.61
  5. Step 5: Solve for x
    x = 5,366.61/61.56
  6. Step 6: Final answer
    x = 87.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.