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Finding the Fourth Proportional to 1,212.47, 1,674.02 and 819.35

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Solution

The fourth proportional to 1,212.47, 1,674.02 and 819.35 is: 1,131.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.47 : 1,674.02 = 819.35 : x
  2. Step 2: Convert to fraction form
    1,212.47/1,674.02 = 819.35/x
  3. Step 3: Cross multiply
    1,212.47x = 1,674.02 × 819.35
  4. Step 4: Simplify right side
    1,212.47x = 1,371,604.19
  5. Step 5: Solve for x
    x = 1,371,604.19/1,212.47
  6. Step 6: Final answer
    x = 1,131.25

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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.