Home / 1,278.05-1,918.28-1,198.46

Finding the Fourth Proportional to 1,278.05, 1,918.28 and 1,198.46

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Solution

The fourth proportional to 1,278.05, 1,918.28 and 1,198.46 is: 1,798.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.05 : 1,918.28 = 1,198.46 : x
  2. Step 2: Convert to fraction form
    1,278.05/1,918.28 = 1,198.46/x
  3. Step 3: Cross multiply
    1,278.05x = 1,918.28 × 1,198.46
  4. Step 4: Simplify right side
    1,278.05x = 2,298,989.64
  5. Step 5: Solve for x
    x = 2,298,989.64/1,278.05
  6. Step 6: Final answer
    x = 1,798.83

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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.