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Finding the Fourth Proportional to 67.72, 101.58 and 54.30

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Solution

The fourth proportional to 67.72, 101.58 and 54.30 is: 81.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.72 : 101.58 = 54.30 : x
  2. Step 2: Convert to fraction form
    67.72/101.58 = 54.30/x
  3. Step 3: Cross multiply
    67.72x = 101.58 × 54.30
  4. Step 4: Simplify right side
    67.72x = 5,515.79
  5. Step 5: Solve for x
    x = 5,515.79/67.72
  6. Step 6: Final answer
    x = 81.45

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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.