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Finding the Fourth Proportional to 825.61, 1,139.52 and 494.11

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Solution

The fourth proportional to 825.61, 1,139.52 and 494.11 is: 681.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.61 : 1,139.52 = 494.11 : x
  2. Step 2: Convert to fraction form
    825.61/1,139.52 = 494.11/x
  3. Step 3: Cross multiply
    825.61x = 1,139.52 × 494.11
  4. Step 4: Simplify right side
    825.61x = 563,048.23
  5. Step 5: Solve for x
    x = 563,048.23/825.61
  6. Step 6: Final answer
    x = 681.98

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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.