Home / 2,918.78-4,378.14-1,187.36

Finding the Fourth Proportional to 2,918.78, 4,378.14 and 1,187.36

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Solution

The fourth proportional to 2,918.78, 4,378.14 and 1,187.36 is: 1,781.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,918.78 : 4,378.14 = 1,187.36 : x
  2. Step 2: Convert to fraction form
    2,918.78/4,378.14 = 1,187.36/x
  3. Step 3: Cross multiply
    2,918.78x = 4,378.14 × 1,187.36
  4. Step 4: Simplify right side
    2,918.78x = 5,198,428.31
  5. Step 5: Solve for x
    x = 5,198,428.31/2,918.78
  6. Step 6: Final answer
    x = 1,781.03

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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.