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Finding the Fourth Proportional to 9.89, 13.62 and 8.58

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Solution

The fourth proportional to 9.89, 13.62 and 8.58 is: 11.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.89 : 13.62 = 8.58 : x
  2. Step 2: Convert to fraction form
    9.89/13.62 = 8.58/x
  3. Step 3: Cross multiply
    9.89x = 13.62 × 8.58
  4. Step 4: Simplify right side
    9.89x = 116.86
  5. Step 5: Solve for x
    x = 116.86/9.89
  6. Step 6: Final answer
    x = 11.82

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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.