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Finding the Fourth Proportional to 60.39, 91.08 and 57.78

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Solution

The fourth proportional to 60.39, 91.08 and 57.78 is: 87.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.39 : 91.08 = 57.78 : x
  2. Step 2: Convert to fraction form
    60.39/91.08 = 57.78/x
  3. Step 3: Cross multiply
    60.39x = 91.08 × 57.78
  4. Step 4: Simplify right side
    60.39x = 5,262.60
  5. Step 5: Solve for x
    x = 5,262.60/60.39
  6. Step 6: Final answer
    x = 87.14

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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.