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Finding the Fourth Proportional to 664.20, 914.76 and 489.24

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Solution

The fourth proportional to 664.20, 914.76 and 489.24 is: 673.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.20 : 914.76 = 489.24 : x
  2. Step 2: Convert to fraction form
    664.20/914.76 = 489.24/x
  3. Step 3: Cross multiply
    664.20x = 914.76 × 489.24
  4. Step 4: Simplify right side
    664.20x = 447,537.18
  5. Step 5: Solve for x
    x = 447,537.18/664.20
  6. Step 6: Final answer
    x = 673.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.