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Finding the Fourth Proportional to 40.72, 60.72 and 39.84

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Solution

The fourth proportional to 40.72, 60.72 and 39.84 is: 59.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.72 : 60.72 = 39.84 : x
  2. Step 2: Convert to fraction form
    40.72/60.72 = 39.84/x
  3. Step 3: Cross multiply
    40.72x = 60.72 × 39.84
  4. Step 4: Simplify right side
    40.72x = 2,419.08
  5. Step 5: Solve for x
    x = 2,419.08/40.72
  6. Step 6: Final answer
    x = 59.41

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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.