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Finding the Fourth Proportional to 39.72, 54.84 and 38.08

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Solution

The fourth proportional to 39.72, 54.84 and 38.08 is: 52.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.72 : 54.84 = 38.08 : x
  2. Step 2: Convert to fraction form
    39.72/54.84 = 38.08/x
  3. Step 3: Cross multiply
    39.72x = 54.84 × 38.08
  4. Step 4: Simplify right side
    39.72x = 2,088.31
  5. Step 5: Solve for x
    x = 2,088.31/39.72
  6. Step 6: Final answer
    x = 52.58

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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.