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Finding the Fourth Proportional to 50.15, 74.90 and 39.97

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Solution

The fourth proportional to 50.15, 74.90 and 39.97 is: 59.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.15 : 74.90 = 39.97 : x
  2. Step 2: Convert to fraction form
    50.15/74.90 = 39.97/x
  3. Step 3: Cross multiply
    50.15x = 74.90 × 39.97
  4. Step 4: Simplify right side
    50.15x = 2,993.95
  5. Step 5: Solve for x
    x = 2,993.95/50.15
  6. Step 6: Final answer
    x = 59.70

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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.