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Finding the Fourth Proportional to 60.89, 91.38 and 45.71

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Solution

The fourth proportional to 60.89, 91.38 and 45.71 is: 68.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.89 : 91.38 = 45.71 : x
  2. Step 2: Convert to fraction form
    60.89/91.38 = 45.71/x
  3. Step 3: Cross multiply
    60.89x = 91.38 × 45.71
  4. Step 4: Simplify right side
    60.89x = 4,177.27
  5. Step 5: Solve for x
    x = 4,177.27/60.89
  6. Step 6: Final answer
    x = 68.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.