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Finding the Fourth Proportional to 825.82, 1,139.76 and 531.40

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Solution

The fourth proportional to 825.82, 1,139.76 and 531.40 is: 733.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.82 : 1,139.76 = 531.40 : x
  2. Step 2: Convert to fraction form
    825.82/1,139.76 = 531.40/x
  3. Step 3: Cross multiply
    825.82x = 1,139.76 × 531.40
  4. Step 4: Simplify right side
    825.82x = 605,668.46
  5. Step 5: Solve for x
    x = 605,668.46/825.82
  6. Step 6: Final answer
    x = 733.41

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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.