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Finding the Fourth Proportional to 724.28, 999.60 and 680.36

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Solution

The fourth proportional to 724.28, 999.60 and 680.36 is: 938.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.28 : 999.60 = 680.36 : x
  2. Step 2: Convert to fraction form
    724.28/999.60 = 680.36/x
  3. Step 3: Cross multiply
    724.28x = 999.60 × 680.36
  4. Step 4: Simplify right side
    724.28x = 680,087.86
  5. Step 5: Solve for x
    x = 680,087.86/724.28
  6. Step 6: Final answer
    x = 938.98

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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.