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Finding the Fourth Proportional to 60.71, 90.87 and 42.45

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Solution

The fourth proportional to 60.71, 90.87 and 42.45 is: 63.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.71 : 90.87 = 42.45 : x
  2. Step 2: Convert to fraction form
    60.71/90.87 = 42.45/x
  3. Step 3: Cross multiply
    60.71x = 90.87 × 42.45
  4. Step 4: Simplify right side
    60.71x = 3,857.93
  5. Step 5: Solve for x
    x = 3,857.93/60.71
  6. Step 6: Final answer
    x = 63.54

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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.