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Finding the Fourth Proportional to 39.18, 54.11 and 34.82

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Solution

The fourth proportional to 39.18, 54.11 and 34.82 is: 48.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.18 : 54.11 = 34.82 : x
  2. Step 2: Convert to fraction form
    39.18/54.11 = 34.82/x
  3. Step 3: Cross multiply
    39.18x = 54.11 × 34.82
  4. Step 4: Simplify right side
    39.18x = 1,883.67
  5. Step 5: Solve for x
    x = 1,883.67/39.18
  6. Step 6: Final answer
    x = 48.08

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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.