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Finding the Fourth Proportional to 11.49, 15.88 and 9.79

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Solution

The fourth proportional to 11.49, 15.88 and 9.79 is: 13.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.49 : 15.88 = 9.79 : x
  2. Step 2: Convert to fraction form
    11.49/15.88 = 9.79/x
  3. Step 3: Cross multiply
    11.49x = 15.88 × 9.79
  4. Step 4: Simplify right side
    11.49x = 155.47
  5. Step 5: Solve for x
    x = 155.47/11.49
  6. Step 6: Final answer
    x = 13.53

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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.