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Finding the Fourth Proportional to 825.66, 1,139.36 and 494.09

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Solution

The fourth proportional to 825.66, 1,139.36 and 494.09 is: 681.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.66 : 1,139.36 = 494.09 : x
  2. Step 2: Convert to fraction form
    825.66/1,139.36 = 494.09/x
  3. Step 3: Cross multiply
    825.66x = 1,139.36 × 494.09
  4. Step 4: Simplify right side
    825.66x = 562,938.22
  5. Step 5: Solve for x
    x = 562,938.22/825.66
  6. Step 6: Final answer
    x = 681.80

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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.