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Finding the Fourth Proportional to 10.98, 15.16 and 6.61

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Solution

The fourth proportional to 10.98, 15.16 and 6.61 is: 9.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.98 : 15.16 = 6.61 : x
  2. Step 2: Convert to fraction form
    10.98/15.16 = 6.61/x
  3. Step 3: Cross multiply
    10.98x = 15.16 × 6.61
  4. Step 4: Simplify right side
    10.98x = 100.21
  5. Step 5: Solve for x
    x = 100.21/10.98
  6. Step 6: Final answer
    x = 9.13

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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.