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Finding the Fourth Proportional to 719.38, 1,079.20 and 426.73

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Solution

The fourth proportional to 719.38, 1,079.20 and 426.73 is: 640.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.38 : 1,079.20 = 426.73 : x
  2. Step 2: Convert to fraction form
    719.38/1,079.20 = 426.73/x
  3. Step 3: Cross multiply
    719.38x = 1,079.20 × 426.73
  4. Step 4: Simplify right side
    719.38x = 460,527.02
  5. Step 5: Solve for x
    x = 460,527.02/719.38
  6. Step 6: Final answer
    x = 640.18

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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.