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Finding the Fourth Proportional to 857.57, 1,183.05 and 680.60

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Solution

The fourth proportional to 857.57, 1,183.05 and 680.60 is: 938.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.57 : 1,183.05 = 680.60 : x
  2. Step 2: Convert to fraction form
    857.57/1,183.05 = 680.60/x
  3. Step 3: Cross multiply
    857.57x = 1,183.05 × 680.60
  4. Step 4: Simplify right side
    857.57x = 805,177.91
  5. Step 5: Solve for x
    x = 805,177.91/857.57
  6. Step 6: Final answer
    x = 938.91

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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.