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Finding the Fourth Proportional to 15.49, 21.32 and 11.39

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Solution

The fourth proportional to 15.49, 21.32 and 11.39 is: 15.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.49 : 21.32 = 11.39 : x
  2. Step 2: Convert to fraction form
    15.49/21.32 = 11.39/x
  3. Step 3: Cross multiply
    15.49x = 21.32 × 11.39
  4. Step 4: Simplify right side
    15.49x = 242.83
  5. Step 5: Solve for x
    x = 242.83/15.49
  6. Step 6: Final answer
    x = 15.68

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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.