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Finding the Fourth Proportional to 843.12, 1,263.11 and 431.82

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Solution

The fourth proportional to 843.12, 1,263.11 and 431.82 is: 646.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.12 : 1,263.11 = 431.82 : x
  2. Step 2: Convert to fraction form
    843.12/1,263.11 = 431.82/x
  3. Step 3: Cross multiply
    843.12x = 1,263.11 × 431.82
  4. Step 4: Simplify right side
    843.12x = 545,434.00
  5. Step 5: Solve for x
    x = 545,434.00/843.12
  6. Step 6: Final answer
    x = 646.92

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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.