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Finding the Fourth Proportional to 825.11, 1,138.80 and 489.08

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Solution

The fourth proportional to 825.11, 1,138.80 and 489.08 is: 675.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.11 : 1,138.80 = 489.08 : x
  2. Step 2: Convert to fraction form
    825.11/1,138.80 = 489.08/x
  3. Step 3: Cross multiply
    825.11x = 1,138.80 × 489.08
  4. Step 4: Simplify right side
    825.11x = 556,958.61
  5. Step 5: Solve for x
    x = 556,958.61/825.11
  6. Step 6: Final answer
    x = 675.02

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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.