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Finding the Fourth Proportional to 8.76, 12.09 and 5.69

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Solution

The fourth proportional to 8.76, 12.09 and 5.69 is: 7.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.76 : 12.09 = 5.69 : x
  2. Step 2: Convert to fraction form
    8.76/12.09 = 5.69/x
  3. Step 3: Cross multiply
    8.76x = 12.09 × 5.69
  4. Step 4: Simplify right side
    8.76x = 68.79
  5. Step 5: Solve for x
    x = 68.79/8.76
  6. Step 6: Final answer
    x = 7.85

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Find fourth proportional to 4.38, 6.05 and 2.85
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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.