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Finding the Fourth Proportional to 825.76, 1,139.40 and 494.21

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Solution

The fourth proportional to 825.76, 1,139.40 and 494.21 is: 681.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.76 : 1,139.40 = 494.21 : x
  2. Step 2: Convert to fraction form
    825.76/1,139.40 = 494.21/x
  3. Step 3: Cross multiply
    825.76x = 1,139.40 × 494.21
  4. Step 4: Simplify right side
    825.76x = 563,102.87
  5. Step 5: Solve for x
    x = 563,102.87/825.76
  6. Step 6: Final answer
    x = 681.92

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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.