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Finding the Fourth Proportional to 971.72, 1,456.68 and 355.28

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Solution

The fourth proportional to 971.72, 1,456.68 and 355.28 is: 532.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.72 : 1,456.68 = 355.28 : x
  2. Step 2: Convert to fraction form
    971.72/1,456.68 = 355.28/x
  3. Step 3: Cross multiply
    971.72x = 1,456.68 × 355.28
  4. Step 4: Simplify right side
    971.72x = 517,529.27
  5. Step 5: Solve for x
    x = 517,529.27/971.72
  6. Step 6: Final answer
    x = 532.59

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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.