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Finding the Fourth Proportional to 8.81, 13.20 and 4.29

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Solution

The fourth proportional to 8.81, 13.20 and 4.29 is: 6.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.81 : 13.20 = 4.29 : x
  2. Step 2: Convert to fraction form
    8.81/13.20 = 4.29/x
  3. Step 3: Cross multiply
    8.81x = 13.20 × 4.29
  4. Step 4: Simplify right side
    8.81x = 56.56
  5. Step 5: Solve for x
    x = 56.56/8.81
  6. Step 6: Final answer
    x = 6.42

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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.