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Finding the Fourth Proportional to 871.60, 1,306.08 and 438.96

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Solution

The fourth proportional to 871.60, 1,306.08 and 438.96 is: 657.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.60 : 1,306.08 = 438.96 : x
  2. Step 2: Convert to fraction form
    871.60/1,306.08 = 438.96/x
  3. Step 3: Cross multiply
    871.60x = 1,306.08 × 438.96
  4. Step 4: Simplify right side
    871.60x = 573,316.88
  5. Step 5: Solve for x
    x = 573,316.88/871.60
  6. Step 6: Final answer
    x = 657.78

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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.