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Finding the Fourth Proportional to 897.12, 1,344.89 and 311.72

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Solution

The fourth proportional to 897.12, 1,344.89 and 311.72 is: 467.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.12 : 1,344.89 = 311.72 : x
  2. Step 2: Convert to fraction form
    897.12/1,344.89 = 311.72/x
  3. Step 3: Cross multiply
    897.12x = 1,344.89 × 311.72
  4. Step 4: Simplify right side
    897.12x = 419,220.83
  5. Step 5: Solve for x
    x = 419,220.83/897.12
  6. Step 6: Final answer
    x = 467.30

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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.