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Finding the Fourth Proportional to 49.12, 74.03 and 40.21

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Solution

The fourth proportional to 49.12, 74.03 and 40.21 is: 60.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.12 : 74.03 = 40.21 : x
  2. Step 2: Convert to fraction form
    49.12/74.03 = 40.21/x
  3. Step 3: Cross multiply
    49.12x = 74.03 × 40.21
  4. Step 4: Simplify right side
    49.12x = 2,976.75
  5. Step 5: Solve for x
    x = 2,976.75/49.12
  6. Step 6: Final answer
    x = 60.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.