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Finding the Fourth Proportional to 8.69, 13.02 and 3.87

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Solution

The fourth proportional to 8.69, 13.02 and 3.87 is: 5.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.69 : 13.02 = 3.87 : x
  2. Step 2: Convert to fraction form
    8.69/13.02 = 3.87/x
  3. Step 3: Cross multiply
    8.69x = 13.02 × 3.87
  4. Step 4: Simplify right side
    8.69x = 50.37
  5. Step 5: Solve for x
    x = 50.37/8.69
  6. Step 6: Final answer
    x = 5.80

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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.