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Finding the Fourth Proportional to 809.78, 1,214.69 and 673.79

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Solution

The fourth proportional to 809.78, 1,214.69 and 673.79 is: 1,010.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.78 : 1,214.69 = 673.79 : x
  2. Step 2: Convert to fraction form
    809.78/1,214.69 = 673.79/x
  3. Step 3: Cross multiply
    809.78x = 1,214.69 × 673.79
  4. Step 4: Simplify right side
    809.78x = 818,436.53
  5. Step 5: Solve for x
    x = 818,436.53/809.78
  6. Step 6: Final answer
    x = 1,010.70

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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.