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Finding the Fourth Proportional to 281.28, 421.89 and 75.87

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Solution

The fourth proportional to 281.28, 421.89 and 75.87 is: 113.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.28 : 421.89 = 75.87 : x
  2. Step 2: Convert to fraction form
    281.28/421.89 = 75.87/x
  3. Step 3: Cross multiply
    281.28x = 421.89 × 75.87
  4. Step 4: Simplify right side
    281.28x = 32,008.51
  5. Step 5: Solve for x
    x = 32,008.51/281.28
  6. Step 6: Final answer
    x = 113.79

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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.