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Finding the Fourth Proportional to 983.22, 1,474.53 and 489.12

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Solution

The fourth proportional to 983.22, 1,474.53 and 489.12 is: 733.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.22 : 1,474.53 = 489.12 : x
  2. Step 2: Convert to fraction form
    983.22/1,474.53 = 489.12/x
  3. Step 3: Cross multiply
    983.22x = 1,474.53 × 489.12
  4. Step 4: Simplify right side
    983.22x = 721,222.11
  5. Step 5: Solve for x
    x = 721,222.11/983.22
  6. Step 6: Final answer
    x = 733.53

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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.