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Finding the Fourth Proportional to 15.49, 23.10 and 13.78

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Solution

The fourth proportional to 15.49, 23.10 and 13.78 is: 20.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.49 : 23.10 = 13.78 : x
  2. Step 2: Convert to fraction form
    15.49/23.10 = 13.78/x
  3. Step 3: Cross multiply
    15.49x = 23.10 × 13.78
  4. Step 4: Simplify right side
    15.49x = 318.32
  5. Step 5: Solve for x
    x = 318.32/15.49
  6. Step 6: Final answer
    x = 20.55

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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.