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Finding the Fourth Proportional to 518.39, 777.43 and 426.86

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Solution

The fourth proportional to 518.39, 777.43 and 426.86 is: 640.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.39 : 777.43 = 426.86 : x
  2. Step 2: Convert to fraction form
    518.39/777.43 = 426.86/x
  3. Step 3: Cross multiply
    518.39x = 777.43 × 426.86
  4. Step 4: Simplify right side
    518.39x = 331,853.33
  5. Step 5: Solve for x
    x = 331,853.33/518.39
  6. Step 6: Final answer
    x = 640.16

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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.