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Finding the Fourth Proportional to 808.49, 1,212.84 and 260.48

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Solution

The fourth proportional to 808.49, 1,212.84 and 260.48 is: 390.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.49 : 1,212.84 = 260.48 : x
  2. Step 2: Convert to fraction form
    808.49/1,212.84 = 260.48/x
  3. Step 3: Cross multiply
    808.49x = 1,212.84 × 260.48
  4. Step 4: Simplify right side
    808.49x = 315,920.56
  5. Step 5: Solve for x
    x = 315,920.56/808.49
  6. Step 6: Final answer
    x = 390.75

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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.