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Finding the Fourth Proportional to 11.49, 15.84 and 8.77

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Solution

The fourth proportional to 11.49, 15.84 and 8.77 is: 12.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.49 : 15.84 = 8.77 : x
  2. Step 2: Convert to fraction form
    11.49/15.84 = 8.77/x
  3. Step 3: Cross multiply
    11.49x = 15.84 × 8.77
  4. Step 4: Simplify right side
    11.49x = 138.84
  5. Step 5: Solve for x
    x = 138.84/11.49
  6. Step 6: Final answer
    x = 12.08

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Find fourth proportional to 5.75, 7.92 and 4.38
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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.