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Finding the Fourth Proportional to 724.16, 998.40 and 675.20

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Solution

The fourth proportional to 724.16, 998.40 and 675.20 is: 930.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.16 : 998.40 = 675.20 : x
  2. Step 2: Convert to fraction form
    724.16/998.40 = 675.20/x
  3. Step 3: Cross multiply
    724.16x = 998.40 × 675.20
  4. Step 4: Simplify right side
    724.16x = 674,119.68
  5. Step 5: Solve for x
    x = 674,119.68/724.16
  6. Step 6: Final answer
    x = 930.90

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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.