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Finding the Fourth Proportional to 9.16, 13.72 and 6.61

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Solution

The fourth proportional to 9.16, 13.72 and 6.61 is: 9.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.16 : 13.72 = 6.61 : x
  2. Step 2: Convert to fraction form
    9.16/13.72 = 6.61/x
  3. Step 3: Cross multiply
    9.16x = 13.72 × 6.61
  4. Step 4: Simplify right side
    9.16x = 90.69
  5. Step 5: Solve for x
    x = 90.69/9.16
  6. Step 6: Final answer
    x = 9.90

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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.