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Finding the Fourth Proportional to 857.33, 1,285.31 and 809.04

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Solution

The fourth proportional to 857.33, 1,285.31 and 809.04 is: 1,212.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.33 : 1,285.31 = 809.04 : x
  2. Step 2: Convert to fraction form
    857.33/1,285.31 = 809.04/x
  3. Step 3: Cross multiply
    857.33x = 1,285.31 × 809.04
  4. Step 4: Simplify right side
    857.33x = 1,039,864.41
  5. Step 5: Solve for x
    x = 1,039,864.41/857.33
  6. Step 6: Final answer
    x = 1,212.91

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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.