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Finding the Fourth Proportional to 825.29, 1,139.28 and 531.05

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Solution

The fourth proportional to 825.29, 1,139.28 and 531.05 is: 733.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.29 : 1,139.28 = 531.05 : x
  2. Step 2: Convert to fraction form
    825.29/1,139.28 = 531.05/x
  3. Step 3: Cross multiply
    825.29x = 1,139.28 × 531.05
  4. Step 4: Simplify right side
    825.29x = 605,014.64
  5. Step 5: Solve for x
    x = 605,014.64/825.29
  6. Step 6: Final answer
    x = 733.10

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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.