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Finding the Fourth Proportional to 971.68, 1,456.62 and 423.46

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Solution

The fourth proportional to 971.68, 1,456.62 and 423.46 is: 634.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.68 : 1,456.62 = 423.46 : x
  2. Step 2: Convert to fraction form
    971.68/1,456.62 = 423.46/x
  3. Step 3: Cross multiply
    971.68x = 1,456.62 × 423.46
  4. Step 4: Simplify right side
    971.68x = 616,820.31
  5. Step 5: Solve for x
    x = 616,820.31/971.68
  6. Step 6: Final answer
    x = 634.80

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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.