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Finding the Fourth Proportional to 62.88, 86.74 and 57.08

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Solution

The fourth proportional to 62.88, 86.74 and 57.08 is: 78.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.88 : 86.74 = 57.08 : x
  2. Step 2: Convert to fraction form
    62.88/86.74 = 57.08/x
  3. Step 3: Cross multiply
    62.88x = 86.74 × 57.08
  4. Step 4: Simplify right side
    62.88x = 4,951.12
  5. Step 5: Solve for x
    x = 4,951.12/62.88
  6. Step 6: Final answer
    x = 78.74

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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.