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Finding the Fourth Proportional to 713.28, 983.88 and 489.32

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Solution

The fourth proportional to 713.28, 983.88 and 489.32 is: 674.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.28 : 983.88 = 489.32 : x
  2. Step 2: Convert to fraction form
    713.28/983.88 = 489.32/x
  3. Step 3: Cross multiply
    713.28x = 983.88 × 489.32
  4. Step 4: Simplify right side
    713.28x = 481,432.16
  5. Step 5: Solve for x
    x = 481,432.16/713.28
  6. Step 6: Final answer
    x = 674.96

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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.