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Finding the Fourth Proportional to 806.99, 1,209.40 and 664.43

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Solution

The fourth proportional to 806.99, 1,209.40 and 664.43 is: 995.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.99 : 1,209.40 = 664.43 : x
  2. Step 2: Convert to fraction form
    806.99/1,209.40 = 664.43/x
  3. Step 3: Cross multiply
    806.99x = 1,209.40 × 664.43
  4. Step 4: Simplify right side
    806.99x = 803,552.27
  5. Step 5: Solve for x
    x = 803,552.27/806.99
  6. Step 6: Final answer
    x = 995.75

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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.