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Finding the Fourth Proportional to 862.28, 1,189.87 and 489.17

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Solution

The fourth proportional to 862.28, 1,189.87 and 489.17 is: 675.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.28 : 1,189.87 = 489.17 : x
  2. Step 2: Convert to fraction form
    862.28/1,189.87 = 489.17/x
  3. Step 3: Cross multiply
    862.28x = 1,189.87 × 489.17
  4. Step 4: Simplify right side
    862.28x = 582,042.76
  5. Step 5: Solve for x
    x = 582,042.76/862.28
  6. Step 6: Final answer
    x = 675.01

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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.