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Finding the Fourth Proportional to 971.52, 1,456.80 and 423.36

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Solution

The fourth proportional to 971.52, 1,456.80 and 423.36 is: 634.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.52 : 1,456.80 = 423.36 : x
  2. Step 2: Convert to fraction form
    971.52/1,456.80 = 423.36/x
  3. Step 3: Cross multiply
    971.52x = 1,456.80 × 423.36
  4. Step 4: Simplify right side
    971.52x = 616,750.85
  5. Step 5: Solve for x
    x = 616,750.85/971.52
  6. Step 6: Final answer
    x = 634.83

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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.