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Finding the Fourth Proportional to 71.48, 99.14 and 67.80

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Solution

The fourth proportional to 71.48, 99.14 and 67.80 is: 94.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.48 : 99.14 = 67.80 : x
  2. Step 2: Convert to fraction form
    71.48/99.14 = 67.80/x
  3. Step 3: Cross multiply
    71.48x = 99.14 × 67.80
  4. Step 4: Simplify right side
    71.48x = 6,721.69
  5. Step 5: Solve for x
    x = 6,721.69/71.48
  6. Step 6: Final answer
    x = 94.04

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.