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Finding the Fourth Proportional to 67.42, 100.87 and 48.21

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Solution

The fourth proportional to 67.42, 100.87 and 48.21 is: 72.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.42 : 100.87 = 48.21 : x
  2. Step 2: Convert to fraction form
    67.42/100.87 = 48.21/x
  3. Step 3: Cross multiply
    67.42x = 100.87 × 48.21
  4. Step 4: Simplify right side
    67.42x = 4,862.94
  5. Step 5: Solve for x
    x = 4,862.94/67.42
  6. Step 6: Final answer
    x = 72.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.