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Finding the Fourth Proportional to 725.60, 1,008.28 and 718.08

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Solution

The fourth proportional to 725.60, 1,008.28 and 718.08 is: 997.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.60 : 1,008.28 = 718.08 : x
  2. Step 2: Convert to fraction form
    725.60/1,008.28 = 718.08/x
  3. Step 3: Cross multiply
    725.60x = 1,008.28 × 718.08
  4. Step 4: Simplify right side
    725.60x = 724,025.70
  5. Step 5: Solve for x
    x = 724,025.70/725.60
  6. Step 6: Final answer
    x = 997.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.