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Finding the Fourth Proportional to 40.30, 55.49 and 30.48

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Solution

The fourth proportional to 40.30, 55.49 and 30.48 is: 41.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.30 : 55.49 = 30.48 : x
  2. Step 2: Convert to fraction form
    40.30/55.49 = 30.48/x
  3. Step 3: Cross multiply
    40.30x = 55.49 × 30.48
  4. Step 4: Simplify right side
    40.30x = 1,691.34
  5. Step 5: Solve for x
    x = 1,691.34/40.30
  6. Step 6: Final answer
    x = 41.97

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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.