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Finding the Fourth Proportional to 806.12, 1,209.15 and 286.10

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Solution

The fourth proportional to 806.12, 1,209.15 and 286.10 is: 429.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.12 : 1,209.15 = 286.10 : x
  2. Step 2: Convert to fraction form
    806.12/1,209.15 = 286.10/x
  3. Step 3: Cross multiply
    806.12x = 1,209.15 × 286.10
  4. Step 4: Simplify right side
    806.12x = 345,936.38
  5. Step 5: Solve for x
    x = 345,936.38/806.12
  6. Step 6: Final answer
    x = 429.14

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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.