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Finding the Fourth Proportional to 971.20, 1,456.96 and 355.12

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Solution

The fourth proportional to 971.20, 1,456.96 and 355.12 is: 532.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.20 : 1,456.96 = 355.12 : x
  2. Step 2: Convert to fraction form
    971.20/1,456.96 = 355.12/x
  3. Step 3: Cross multiply
    971.20x = 1,456.96 × 355.12
  4. Step 4: Simplify right side
    971.20x = 517,395.64
  5. Step 5: Solve for x
    x = 517,395.64/971.20
  6. Step 6: Final answer
    x = 532.74

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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.