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Finding the Fourth Proportional to 7.61, 11.39 and 6.89

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Solution

The fourth proportional to 7.61, 11.39 and 6.89 is: 10.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.61 : 11.39 = 6.89 : x
  2. Step 2: Convert to fraction form
    7.61/11.39 = 6.89/x
  3. Step 3: Cross multiply
    7.61x = 11.39 × 6.89
  4. Step 4: Simplify right side
    7.61x = 78.39
  5. Step 5: Solve for x
    x = 78.39/7.61
  6. Step 6: Final answer
    x = 10.31

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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.