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Finding the Fourth Proportional to 839.20, 1,157.04 and 617.44

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Solution

The fourth proportional to 839.20, 1,157.04 and 617.44 is: 851.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.20 : 1,157.04 = 617.44 : x
  2. Step 2: Convert to fraction form
    839.20/1,157.04 = 617.44/x
  3. Step 3: Cross multiply
    839.20x = 1,157.04 × 617.44
  4. Step 4: Simplify right side
    839.20x = 714,402.78
  5. Step 5: Solve for x
    x = 714,402.78/839.20
  6. Step 6: Final answer
    x = 851.29

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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.