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Finding the Fourth Proportional to 806.14, 1,209.21 and 517.38

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Solution

The fourth proportional to 806.14, 1,209.21 and 517.38 is: 776.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.14 : 1,209.21 = 517.38 : x
  2. Step 2: Convert to fraction form
    806.14/1,209.21 = 517.38/x
  3. Step 3: Cross multiply
    806.14x = 1,209.21 × 517.38
  4. Step 4: Simplify right side
    806.14x = 625,621.07
  5. Step 5: Solve for x
    x = 625,621.07/806.14
  6. Step 6: Final answer
    x = 776.07

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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.