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Finding the Fourth Proportional to 281.40, 421.29 and 159.45

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Solution

The fourth proportional to 281.40, 421.29 and 159.45 is: 238.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.40 : 421.29 = 159.45 : x
  2. Step 2: Convert to fraction form
    281.40/421.29 = 159.45/x
  3. Step 3: Cross multiply
    281.40x = 421.29 × 159.45
  4. Step 4: Simplify right side
    281.40x = 67,174.69
  5. Step 5: Solve for x
    x = 67,174.69/281.40
  6. Step 6: Final answer
    x = 238.72

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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.