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Finding the Fourth Proportional to 817.96, 1,225.96 and 379.52

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Solution

The fourth proportional to 817.96, 1,225.96 and 379.52 is: 568.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.96 : 1,225.96 = 379.52 : x
  2. Step 2: Convert to fraction form
    817.96/1,225.96 = 379.52/x
  3. Step 3: Cross multiply
    817.96x = 1,225.96 × 379.52
  4. Step 4: Simplify right side
    817.96x = 465,276.34
  5. Step 5: Solve for x
    x = 465,276.34/817.96
  6. Step 6: Final answer
    x = 568.83

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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.