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Finding the Fourth Proportional to 10.92, 15.08 and 8.20

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Solution

The fourth proportional to 10.92, 15.08 and 8.20 is: 11.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.92 : 15.08 = 8.20 : x
  2. Step 2: Convert to fraction form
    10.92/15.08 = 8.20/x
  3. Step 3: Cross multiply
    10.92x = 15.08 × 8.20
  4. Step 4: Simplify right side
    10.92x = 123.66
  5. Step 5: Solve for x
    x = 123.66/10.92
  6. Step 6: Final answer
    x = 11.32

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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.