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Finding the Fourth Proportional to 281.19, 421.69 and 75.70

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Solution

The fourth proportional to 281.19, 421.69 and 75.70 is: 113.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.19 : 421.69 = 75.70 : x
  2. Step 2: Convert to fraction form
    281.19/421.69 = 75.70/x
  3. Step 3: Cross multiply
    281.19x = 421.69 × 75.70
  4. Step 4: Simplify right side
    281.19x = 31,921.93
  5. Step 5: Solve for x
    x = 31,921.93/281.19
  6. Step 6: Final answer
    x = 113.52

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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.