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Finding the Fourth Proportional to 559.43, 839.43 and 423.31

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Solution

The fourth proportional to 559.43, 839.43 and 423.31 is: 635.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.43 : 839.43 = 423.31 : x
  2. Step 2: Convert to fraction form
    559.43/839.43 = 423.31/x
  3. Step 3: Cross multiply
    559.43x = 839.43 × 423.31
  4. Step 4: Simplify right side
    559.43x = 355,332.80
  5. Step 5: Solve for x
    x = 355,332.80/559.43
  6. Step 6: Final answer
    x = 635.18

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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.