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Finding the Fourth Proportional to 1,208.44, 1,809.01 and 855.79

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Solution

The fourth proportional to 1,208.44, 1,809.01 and 855.79 is: 1,281.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.44 : 1,809.01 = 855.79 : x
  2. Step 2: Convert to fraction form
    1,208.44/1,809.01 = 855.79/x
  3. Step 3: Cross multiply
    1,208.44x = 1,809.01 × 855.79
  4. Step 4: Simplify right side
    1,208.44x = 1,548,132.67
  5. Step 5: Solve for x
    x = 1,548,132.67/1,208.44
  6. Step 6: Final answer
    x = 1,281.10

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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.