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Finding the Fourth Proportional to 67.42, 100.64 and 62.87

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Solution

The fourth proportional to 67.42, 100.64 and 62.87 is: 93.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.42 : 100.64 = 62.87 : x
  2. Step 2: Convert to fraction form
    67.42/100.64 = 62.87/x
  3. Step 3: Cross multiply
    67.42x = 100.64 × 62.87
  4. Step 4: Simplify right side
    67.42x = 6,326.89
  5. Step 5: Solve for x
    x = 6,326.89/67.42
  6. Step 6: Final answer
    x = 93.84

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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.