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Finding the Fourth Proportional to 825.81, 1,139.62 and 494.29

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Solution

The fourth proportional to 825.81, 1,139.62 and 494.29 is: 682.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.81 : 1,139.62 = 494.29 : x
  2. Step 2: Convert to fraction form
    825.81/1,139.62 = 494.29/x
  3. Step 3: Cross multiply
    825.81x = 1,139.62 × 494.29
  4. Step 4: Simplify right side
    825.81x = 563,301.16
  5. Step 5: Solve for x
    x = 563,301.16/825.81
  6. Step 6: Final answer
    x = 682.12

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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.