Home / 2,118.62-3,178.46-885.40

Finding the Fourth Proportional to 2,118.62, 3,178.46 and 885.40

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Solution

The fourth proportional to 2,118.62, 3,178.46 and 885.40 is: 1,328.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.62 : 3,178.46 = 885.40 : x
  2. Step 2: Convert to fraction form
    2,118.62/3,178.46 = 885.40/x
  3. Step 3: Cross multiply
    2,118.62x = 3,178.46 × 885.40
  4. Step 4: Simplify right side
    2,118.62x = 2,814,202.75
  5. Step 5: Solve for x
    x = 2,814,202.75/2,118.62
  6. Step 6: Final answer
    x = 1,328.32

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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.