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Finding the Fourth Proportional to 67.40, 100.96 and 42.96

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Solution

The fourth proportional to 67.40, 100.96 and 42.96 is: 64.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.40 : 100.96 = 42.96 : x
  2. Step 2: Convert to fraction form
    67.40/100.96 = 42.96/x
  3. Step 3: Cross multiply
    67.40x = 100.96 × 42.96
  4. Step 4: Simplify right side
    67.40x = 4,337.24
  5. Step 5: Solve for x
    x = 4,337.24/67.40
  6. Step 6: Final answer
    x = 64.35

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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.