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Finding the Fourth Proportional to 11.15, 16.68 and 9.13

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Solution

The fourth proportional to 11.15, 16.68 and 9.13 is: 13.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.15 : 16.68 = 9.13 : x
  2. Step 2: Convert to fraction form
    11.15/16.68 = 9.13/x
  3. Step 3: Cross multiply
    11.15x = 16.68 × 9.13
  4. Step 4: Simplify right side
    11.15x = 152.21
  5. Step 5: Solve for x
    x = 152.21/11.15
  6. Step 6: Final answer
    x = 13.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.