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Finding the Fourth Proportional to 971.20, 1,456.92 and 321.88

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Solution

The fourth proportional to 971.20, 1,456.92 and 321.88 is: 482.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.20 : 1,456.92 = 321.88 : x
  2. Step 2: Convert to fraction form
    971.20/1,456.92 = 321.88/x
  3. Step 3: Cross multiply
    971.20x = 1,456.92 × 321.88
  4. Step 4: Simplify right side
    971.20x = 468,953.41
  5. Step 5: Solve for x
    x = 468,953.41/971.20
  6. Step 6: Final answer
    x = 482.86

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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.