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Finding the Fourth Proportional to 882.20, 1,323.90 and 517.70

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Solution

The fourth proportional to 882.20, 1,323.90 and 517.70 is: 776.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.20 : 1,323.90 = 517.70 : x
  2. Step 2: Convert to fraction form
    882.20/1,323.90 = 517.70/x
  3. Step 3: Cross multiply
    882.20x = 1,323.90 × 517.70
  4. Step 4: Simplify right side
    882.20x = 685,376.41
  5. Step 5: Solve for x
    x = 685,376.41/882.20
  6. Step 6: Final answer
    x = 776.90

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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.