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Finding the Fourth Proportional to 724.68, 1,086.78 and 262.39

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Solution

The fourth proportional to 724.68, 1,086.78 and 262.39 is: 393.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.68 : 1,086.78 = 262.39 : x
  2. Step 2: Convert to fraction form
    724.68/1,086.78 = 262.39/x
  3. Step 3: Cross multiply
    724.68x = 1,086.78 × 262.39
  4. Step 4: Simplify right side
    724.68x = 285,160.20
  5. Step 5: Solve for x
    x = 285,160.20/724.68
  6. Step 6: Final answer
    x = 393.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.