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Finding the Fourth Proportional to 806.21, 1,209.56 and 559.65

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Solution

The fourth proportional to 806.21, 1,209.56 and 559.65 is: 839.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.21 : 1,209.56 = 559.65 : x
  2. Step 2: Convert to fraction form
    806.21/1,209.56 = 559.65/x
  3. Step 3: Cross multiply
    806.21x = 1,209.56 × 559.65
  4. Step 4: Simplify right side
    806.21x = 676,933.31
  5. Step 5: Solve for x
    x = 676,933.31/806.21
  6. Step 6: Final answer
    x = 839.65

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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.