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Finding the Fourth Proportional to 10.92, 15.07 and 6.61

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Solution

The fourth proportional to 10.92, 15.07 and 6.61 is: 9.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.92 : 15.07 = 6.61 : x
  2. Step 2: Convert to fraction form
    10.92/15.07 = 6.61/x
  3. Step 3: Cross multiply
    10.92x = 15.07 × 6.61
  4. Step 4: Simplify right side
    10.92x = 99.61
  5. Step 5: Solve for x
    x = 99.61/10.92
  6. Step 6: Final answer
    x = 9.12

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.