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Finding the Fourth Proportional to 67.85, 93.62 and 38.74

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Solution

The fourth proportional to 67.85, 93.62 and 38.74 is: 53.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.85 : 93.62 = 38.74 : x
  2. Step 2: Convert to fraction form
    67.85/93.62 = 38.74/x
  3. Step 3: Cross multiply
    67.85x = 93.62 × 38.74
  4. Step 4: Simplify right side
    67.85x = 3,626.65
  5. Step 5: Solve for x
    x = 3,626.65/67.85
  6. Step 6: Final answer
    x = 53.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.