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Finding the Fourth Proportional to 908.68, 1,363.19 and 519.12

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Solution

The fourth proportional to 908.68, 1,363.19 and 519.12 is: 778.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.68 : 1,363.19 = 519.12 : x
  2. Step 2: Convert to fraction form
    908.68/1,363.19 = 519.12/x
  3. Step 3: Cross multiply
    908.68x = 1,363.19 × 519.12
  4. Step 4: Simplify right side
    908.68x = 707,656.60
  5. Step 5: Solve for x
    x = 707,656.60/908.68
  6. Step 6: Final answer
    x = 778.78

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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.