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Finding the Fourth Proportional to 281.14, 421.68 and 86.13

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Solution

The fourth proportional to 281.14, 421.68 and 86.13 is: 129.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.14 : 421.68 = 86.13 : x
  2. Step 2: Convert to fraction form
    281.14/421.68 = 86.13/x
  3. Step 3: Cross multiply
    281.14x = 421.68 × 86.13
  4. Step 4: Simplify right side
    281.14x = 36,319.30
  5. Step 5: Solve for x
    x = 36,319.30/281.14
  6. Step 6: Final answer
    x = 129.19

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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.