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Finding the Fourth Proportional to 847.14, 1,269.35 and 641.43

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Solution

The fourth proportional to 847.14, 1,269.35 and 641.43 is: 961.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.14 : 1,269.35 = 641.43 : x
  2. Step 2: Convert to fraction form
    847.14/1,269.35 = 641.43/x
  3. Step 3: Cross multiply
    847.14x = 1,269.35 × 641.43
  4. Step 4: Simplify right side
    847.14x = 814,195.96
  5. Step 5: Solve for x
    x = 814,195.96/847.14
  6. Step 6: Final answer
    x = 961.11

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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.