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Finding the Fourth Proportional to 871.14, 1,306.71 and 221.86

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Solution

The fourth proportional to 871.14, 1,306.71 and 221.86 is: 332.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.14 : 1,306.71 = 221.86 : x
  2. Step 2: Convert to fraction form
    871.14/1,306.71 = 221.86/x
  3. Step 3: Cross multiply
    871.14x = 1,306.71 × 221.86
  4. Step 4: Simplify right side
    871.14x = 289,903.41
  5. Step 5: Solve for x
    x = 289,903.41/871.14
  6. Step 6: Final answer
    x = 332.79

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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.