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Finding the Fourth Proportional to 67.38, 100.68 and 64.20

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Solution

The fourth proportional to 67.38, 100.68 and 64.20 is: 95.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.38 : 100.68 = 64.20 : x
  2. Step 2: Convert to fraction form
    67.38/100.68 = 64.20/x
  3. Step 3: Cross multiply
    67.38x = 100.68 × 64.20
  4. Step 4: Simplify right side
    67.38x = 6,463.66
  5. Step 5: Solve for x
    x = 6,463.66/67.38
  6. Step 6: Final answer
    x = 95.93

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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.