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Finding the Fourth Proportional to 71.25, 106.88 and 67.74

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Solution

The fourth proportional to 71.25, 106.88 and 67.74 is: 101.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.25 : 106.88 = 67.74 : x
  2. Step 2: Convert to fraction form
    71.25/106.88 = 67.74/x
  3. Step 3: Cross multiply
    71.25x = 106.88 × 67.74
  4. Step 4: Simplify right side
    71.25x = 7,239.71
  5. Step 5: Solve for x
    x = 7,239.71/71.25
  6. Step 6: Final answer
    x = 101.61

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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.