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Finding the Fourth Proportional to 825.61, 1,139.32 and 494.04

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Solution

The fourth proportional to 825.61, 1,139.32 and 494.04 is: 681.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.61 : 1,139.32 = 494.04 : x
  2. Step 2: Convert to fraction form
    825.61/1,139.32 = 494.04/x
  3. Step 3: Cross multiply
    825.61x = 1,139.32 × 494.04
  4. Step 4: Simplify right side
    825.61x = 562,869.65
  5. Step 5: Solve for x
    x = 562,869.65/825.61
  6. Step 6: Final answer
    x = 681.76

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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.