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Finding the Fourth Proportional to 9.86, 13.61 and 6.22

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Solution

The fourth proportional to 9.86, 13.61 and 6.22 is: 8.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.86 : 13.61 = 6.22 : x
  2. Step 2: Convert to fraction form
    9.86/13.61 = 6.22/x
  3. Step 3: Cross multiply
    9.86x = 13.61 × 6.22
  4. Step 4: Simplify right side
    9.86x = 84.71
  5. Step 5: Solve for x
    x = 84.71/9.86
  6. Step 6: Final answer
    x = 8.59

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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.