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Finding the Fourth Proportional to 882.43, 1,217.76 and 620.90

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Solution

The fourth proportional to 882.43, 1,217.76 and 620.90 is: 856.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.43 : 1,217.76 = 620.90 : x
  2. Step 2: Convert to fraction form
    882.43/1,217.76 = 620.90/x
  3. Step 3: Cross multiply
    882.43x = 1,217.76 × 620.90
  4. Step 4: Simplify right side
    882.43x = 756,103.33
  5. Step 5: Solve for x
    x = 756,103.33/882.43
  6. Step 6: Final answer
    x = 856.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.