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Finding the Fourth Proportional to 15.15, 22.61 and 13.80

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Solution

The fourth proportional to 15.15, 22.61 and 13.80 is: 20.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.15 : 22.61 = 13.80 : x
  2. Step 2: Convert to fraction form
    15.15/22.61 = 13.80/x
  3. Step 3: Cross multiply
    15.15x = 22.61 × 13.80
  4. Step 4: Simplify right side
    15.15x = 312.14
  5. Step 5: Solve for x
    x = 312.14/15.15
  6. Step 6: Final answer
    x = 20.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.