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Finding the Fourth Proportional to 1,218.73, 1,682.03 and 777.39

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Solution

The fourth proportional to 1,218.73, 1,682.03 and 777.39 is: 1,072.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.73 : 1,682.03 = 777.39 : x
  2. Step 2: Convert to fraction form
    1,218.73/1,682.03 = 777.39/x
  3. Step 3: Cross multiply
    1,218.73x = 1,682.03 × 777.39
  4. Step 4: Simplify right side
    1,218.73x = 1,307,593.30
  5. Step 5: Solve for x
    x = 1,307,593.30/1,218.73
  6. Step 6: Final answer
    x = 1,072.91

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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.