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Finding the Fourth Proportional to 49.27, 68.18 and 42.79

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Solution

The fourth proportional to 49.27, 68.18 and 42.79 is: 59.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.27 : 68.18 = 42.79 : x
  2. Step 2: Convert to fraction form
    49.27/68.18 = 42.79/x
  3. Step 3: Cross multiply
    49.27x = 68.18 × 42.79
  4. Step 4: Simplify right side
    49.27x = 2,917.42
  5. Step 5: Solve for x
    x = 2,917.42/49.27
  6. Step 6: Final answer
    x = 59.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.