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Finding the Fourth Proportional to 825.56, 1,139.36 and 489.66

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Solution

The fourth proportional to 825.56, 1,139.36 and 489.66 is: 675.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.56 : 1,139.36 = 489.66 : x
  2. Step 2: Convert to fraction form
    825.56/1,139.36 = 489.66/x
  3. Step 3: Cross multiply
    825.56x = 1,139.36 × 489.66
  4. Step 4: Simplify right side
    825.56x = 557,896.57
  5. Step 5: Solve for x
    x = 557,896.57/825.56
  6. Step 6: Final answer
    x = 675.78

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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.