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Finding the Fourth Proportional to 40.75, 60.71 and 38.81

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Solution

The fourth proportional to 40.75, 60.71 and 38.81 is: 57.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.75 : 60.71 = 38.81 : x
  2. Step 2: Convert to fraction form
    40.75/60.71 = 38.81/x
  3. Step 3: Cross multiply
    40.75x = 60.71 × 38.81
  4. Step 4: Simplify right side
    40.75x = 2,356.11
  5. Step 5: Solve for x
    x = 2,356.11/40.75
  6. Step 6: Final answer
    x = 57.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.