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Finding the Fourth Proportional to 722.40, 996.56 and 489.52

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Solution

The fourth proportional to 722.40, 996.56 and 489.52 is: 675.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.40 : 996.56 = 489.52 : x
  2. Step 2: Convert to fraction form
    722.40/996.56 = 489.52/x
  3. Step 3: Cross multiply
    722.40x = 996.56 × 489.52
  4. Step 4: Simplify right side
    722.40x = 487,836.05
  5. Step 5: Solve for x
    x = 487,836.05/722.40
  6. Step 6: Final answer
    x = 675.30

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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.