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Finding the Fourth Proportional to 29.80, 41.13 and 18.15

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Solution

The fourth proportional to 29.80, 41.13 and 18.15 is: 25.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.80 : 41.13 = 18.15 : x
  2. Step 2: Convert to fraction form
    29.80/41.13 = 18.15/x
  3. Step 3: Cross multiply
    29.80x = 41.13 × 18.15
  4. Step 4: Simplify right side
    29.80x = 746.61
  5. Step 5: Solve for x
    x = 746.61/29.80
  6. Step 6: Final answer
    x = 25.05

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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.