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Finding the Fourth Proportional to 897.20, 1,344.31 and 311.89

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Solution

The fourth proportional to 897.20, 1,344.31 and 311.89 is: 467.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.20 : 1,344.31 = 311.89 : x
  2. Step 2: Convert to fraction form
    897.20/1,344.31 = 311.89/x
  3. Step 3: Cross multiply
    897.20x = 1,344.31 × 311.89
  4. Step 4: Simplify right side
    897.20x = 419,276.85
  5. Step 5: Solve for x
    x = 419,276.85/897.20
  6. Step 6: Final answer
    x = 467.32

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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.