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Finding the Fourth Proportional to 67.38, 93 and 39.75

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Solution

The fourth proportional to 67.38, 93 and 39.75 is: 54.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.38 : 93 = 39.75 : x
  2. Step 2: Convert to fraction form
    67.38/93 = 39.75/x
  3. Step 3: Cross multiply
    67.38x = 93 × 39.75
  4. Step 4: Simplify right side
    67.38x = 3,696.75
  5. Step 5: Solve for x
    x = 3,696.75/67.38
  6. Step 6: Final answer
    x = 54.86

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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.