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Finding the Fourth Proportional to 806.13, 1,209.38 and 440.73

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Solution

The fourth proportional to 806.13, 1,209.38 and 440.73 is: 661.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.13 : 1,209.38 = 440.73 : x
  2. Step 2: Convert to fraction form
    806.13/1,209.38 = 440.73/x
  3. Step 3: Cross multiply
    806.13x = 1,209.38 × 440.73
  4. Step 4: Simplify right side
    806.13x = 533,007.84
  5. Step 5: Solve for x
    x = 533,007.84/806.13
  6. Step 6: Final answer
    x = 661.19

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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.