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Finding the Fourth Proportional to 728.20, 1,003.26 and 617.32

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Solution

The fourth proportional to 728.20, 1,003.26 and 617.32 is: 850.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.20 : 1,003.26 = 617.32 : x
  2. Step 2: Convert to fraction form
    728.20/1,003.26 = 617.32/x
  3. Step 3: Cross multiply
    728.20x = 1,003.26 × 617.32
  4. Step 4: Simplify right side
    728.20x = 619,332.46
  5. Step 5: Solve for x
    x = 619,332.46/728.20
  6. Step 6: Final answer
    x = 850.50

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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.