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Finding the Fourth Proportional to 664.52, 915.74 and 489.56

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Solution

The fourth proportional to 664.52, 915.74 and 489.56 is: 674.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.52 : 915.74 = 489.56 : x
  2. Step 2: Convert to fraction form
    664.52/915.74 = 489.56/x
  3. Step 3: Cross multiply
    664.52x = 915.74 × 489.56
  4. Step 4: Simplify right side
    664.52x = 448,309.67
  5. Step 5: Solve for x
    x = 448,309.67/664.52
  6. Step 6: Final answer
    x = 674.64

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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.