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Finding the Fourth Proportional to 971.31, 1,456.71 and 423.38

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Solution

The fourth proportional to 971.31, 1,456.71 and 423.38 is: 634.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.31 : 1,456.71 = 423.38 : x
  2. Step 2: Convert to fraction form
    971.31/1,456.71 = 423.38/x
  3. Step 3: Cross multiply
    971.31x = 1,456.71 × 423.38
  4. Step 4: Simplify right side
    971.31x = 616,734.60
  5. Step 5: Solve for x
    x = 616,734.60/971.31
  6. Step 6: Final answer
    x = 634.95

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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.