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Finding the Fourth Proportional to 1,212.73, 1,674.34 and 839.57

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Solution

The fourth proportional to 1,212.73, 1,674.34 and 839.57 is: 1,159.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.73 : 1,674.34 = 839.57 : x
  2. Step 2: Convert to fraction form
    1,212.73/1,674.34 = 839.57/x
  3. Step 3: Cross multiply
    1,212.73x = 1,674.34 × 839.57
  4. Step 4: Simplify right side
    1,212.73x = 1,405,729.29
  5. Step 5: Solve for x
    x = 1,405,729.29/1,212.73
  6. Step 6: Final answer
    x = 1,159.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.