Home / 2,118.80-3,178.20-1,252.50

Finding the Fourth Proportional to 2,118.80, 3,178.20 and 1,252.50

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Solution

The fourth proportional to 2,118.80, 3,178.20 and 1,252.50 is: 1,878.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.80 : 3,178.20 = 1,252.50 : x
  2. Step 2: Convert to fraction form
    2,118.80/3,178.20 = 1,252.50/x
  3. Step 3: Cross multiply
    2,118.80x = 3,178.20 × 1,252.50
  4. Step 4: Simplify right side
    2,118.80x = 3,980,695.50
  5. Step 5: Solve for x
    x = 3,980,695.50/2,118.80
  6. Step 6: Final answer
    x = 1,878.75

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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.