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Finding the Fourth Proportional to 15.67, 21.49 and 15.18

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Solution

The fourth proportional to 15.67, 21.49 and 15.18 is: 20.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.67 : 21.49 = 15.18 : x
  2. Step 2: Convert to fraction form
    15.67/21.49 = 15.18/x
  3. Step 3: Cross multiply
    15.67x = 21.49 × 15.18
  4. Step 4: Simplify right side
    15.67x = 326.22
  5. Step 5: Solve for x
    x = 326.22/15.67
  6. Step 6: Final answer
    x = 20.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.