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Finding the Fourth Proportional to 67.72, 93.45 and 39.72

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Solution

The fourth proportional to 67.72, 93.45 and 39.72 is: 54.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.72 : 93.45 = 39.72 : x
  2. Step 2: Convert to fraction form
    67.72/93.45 = 39.72/x
  3. Step 3: Cross multiply
    67.72x = 93.45 × 39.72
  4. Step 4: Simplify right side
    67.72x = 3,711.54
  5. Step 5: Solve for x
    x = 3,711.54/67.72
  6. Step 6: Final answer
    x = 54.80

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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.