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Finding the Fourth Proportional to 15.44, 21.28 and 13.13

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Solution

The fourth proportional to 15.44, 21.28 and 13.13 is: 18.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.44 : 21.28 = 13.13 : x
  2. Step 2: Convert to fraction form
    15.44/21.28 = 13.13/x
  3. Step 3: Cross multiply
    15.44x = 21.28 × 13.13
  4. Step 4: Simplify right side
    15.44x = 279.41
  5. Step 5: Solve for x
    x = 279.41/15.44
  6. Step 6: Final answer
    x = 18.10

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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.