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Finding the Fourth Proportional to 67.48, 100.69 and 66.79

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Solution

The fourth proportional to 67.48, 100.69 and 66.79 is: 99.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.48 : 100.69 = 66.79 : x
  2. Step 2: Convert to fraction form
    67.48/100.69 = 66.79/x
  3. Step 3: Cross multiply
    67.48x = 100.69 × 66.79
  4. Step 4: Simplify right side
    67.48x = 6,725.09
  5. Step 5: Solve for x
    x = 6,725.09/67.48
  6. Step 6: Final answer
    x = 99.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.