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Finding the Fourth Proportional to 48.78, 67.31 and 30.11

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Solution

The fourth proportional to 48.78, 67.31 and 30.11 is: 41.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.78 : 67.31 = 30.11 : x
  2. Step 2: Convert to fraction form
    48.78/67.31 = 30.11/x
  3. Step 3: Cross multiply
    48.78x = 67.31 × 30.11
  4. Step 4: Simplify right side
    48.78x = 2,026.94
  5. Step 5: Solve for x
    x = 2,026.94/48.78
  6. Step 6: Final answer
    x = 41.55

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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.