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Finding the Fourth Proportional to 67.04, 100.64 and 38.56

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Solution

The fourth proportional to 67.04, 100.64 and 38.56 is: 57.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.04 : 100.64 = 38.56 : x
  2. Step 2: Convert to fraction form
    67.04/100.64 = 38.56/x
  3. Step 3: Cross multiply
    67.04x = 100.64 × 38.56
  4. Step 4: Simplify right side
    67.04x = 3,880.68
  5. Step 5: Solve for x
    x = 3,880.68/67.04
  6. Step 6: Final answer
    x = 57.89

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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.