Home / 2,217.20-3,325.80-678.20

Finding the Fourth Proportional to 2,217.20, 3,325.80 and 678.20

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Solution

The fourth proportional to 2,217.20, 3,325.80 and 678.20 is: 1,017.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,217.20 : 3,325.80 = 678.20 : x
  2. Step 2: Convert to fraction form
    2,217.20/3,325.80 = 678.20/x
  3. Step 3: Cross multiply
    2,217.20x = 3,325.80 × 678.20
  4. Step 4: Simplify right side
    2,217.20x = 2,255,557.56
  5. Step 5: Solve for x
    x = 2,255,557.56/2,217.20
  6. Step 6: Final answer
    x = 1,017.30

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1.5x scale

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.