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Finding the Fourth Proportional to 9.39, 14.02 and 7.89

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Solution

The fourth proportional to 9.39, 14.02 and 7.89 is: 11.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.39 : 14.02 = 7.89 : x
  2. Step 2: Convert to fraction form
    9.39/14.02 = 7.89/x
  3. Step 3: Cross multiply
    9.39x = 14.02 × 7.89
  4. Step 4: Simplify right side
    9.39x = 110.62
  5. Step 5: Solve for x
    x = 110.62/9.39
  6. Step 6: Final answer
    x = 11.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.