Home / 2,121.18-3,178.89-1,095.90

Finding the Fourth Proportional to 2,121.18, 3,178.89 and 1,095.90

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Solution

The fourth proportional to 2,121.18, 3,178.89 and 1,095.90 is: 1,642.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.18 : 3,178.89 = 1,095.90 : x
  2. Step 2: Convert to fraction form
    2,121.18/3,178.89 = 1,095.90/x
  3. Step 3: Cross multiply
    2,121.18x = 3,178.89 × 1,095.90
  4. Step 4: Simplify right side
    2,121.18x = 3,483,745.55
  5. Step 5: Solve for x
    x = 3,483,745.55/2,121.18
  6. Step 6: Final answer
    x = 1,642.36

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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.