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Finding the Fourth Proportional to 825.74, 1,139.34 and 494.12

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Solution

The fourth proportional to 825.74, 1,139.34 and 494.12 is: 681.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.74 : 1,139.34 = 494.12 : x
  2. Step 2: Convert to fraction form
    825.74/1,139.34 = 494.12/x
  3. Step 3: Cross multiply
    825.74x = 1,139.34 × 494.12
  4. Step 4: Simplify right side
    825.74x = 562,970.68
  5. Step 5: Solve for x
    x = 562,970.68/825.74
  6. Step 6: Final answer
    x = 681.78

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1.5x scale

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.