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Finding the Fourth Proportional to 806.43, 1,209.99 and 440.79

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Solution

The fourth proportional to 806.43, 1,209.99 and 440.79 is: 661.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.43 : 1,209.99 = 440.79 : x
  2. Step 2: Convert to fraction form
    806.43/1,209.99 = 440.79/x
  3. Step 3: Cross multiply
    806.43x = 1,209.99 × 440.79
  4. Step 4: Simplify right side
    806.43x = 533,356.88
  5. Step 5: Solve for x
    x = 533,356.88/806.43
  6. Step 6: Final answer
    x = 661.38

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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.