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Finding the Fourth Proportional to 843.80, 1,263.74 and 431.91

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Solution

The fourth proportional to 843.80, 1,263.74 and 431.91 is: 646.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.80 : 1,263.74 = 431.91 : x
  2. Step 2: Convert to fraction form
    843.80/1,263.74 = 431.91/x
  3. Step 3: Cross multiply
    843.80x = 1,263.74 × 431.91
  4. Step 4: Simplify right side
    843.80x = 545,819.78
  5. Step 5: Solve for x
    x = 545,819.78/843.80
  6. Step 6: Final answer
    x = 646.86

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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.