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Finding the Fourth Proportional to 807.91, 1,212.59 and 423.43

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Solution

The fourth proportional to 807.91, 1,212.59 and 423.43 is: 635.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.91 : 1,212.59 = 423.43 : x
  2. Step 2: Convert to fraction form
    807.91/1,212.59 = 423.43/x
  3. Step 3: Cross multiply
    807.91x = 1,212.59 × 423.43
  4. Step 4: Simplify right side
    807.91x = 513,446.98
  5. Step 5: Solve for x
    x = 513,446.98/807.91
  6. Step 6: Final answer
    x = 635.52

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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.