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Finding the Fourth Proportional to 825.68, 1,139.45 and 494.13

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Solution

The fourth proportional to 825.68, 1,139.45 and 494.13 is: 681.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.68 : 1,139.45 = 494.13 : x
  2. Step 2: Convert to fraction form
    825.68/1,139.45 = 494.13/x
  3. Step 3: Cross multiply
    825.68x = 1,139.45 × 494.13
  4. Step 4: Simplify right side
    825.68x = 563,036.43
  5. Step 5: Solve for x
    x = 563,036.43/825.68
  6. Step 6: Final answer
    x = 681.91

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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.