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Finding the Fourth Proportional to 281.48, 421.45 and 159.57

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Solution

The fourth proportional to 281.48, 421.45 and 159.57 is: 238.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.48 : 421.45 = 159.57 : x
  2. Step 2: Convert to fraction form
    281.48/421.45 = 159.57/x
  3. Step 3: Cross multiply
    281.48x = 421.45 × 159.57
  4. Step 4: Simplify right side
    281.48x = 67,251.28
  5. Step 5: Solve for x
    x = 67,251.28/281.48
  6. Step 6: Final answer
    x = 238.92

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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.