Home / 2,219.40-3,326.40-1,987.20

Finding the Fourth Proportional to 2,219.40, 3,326.40 and 1,987.20

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Solution

The fourth proportional to 2,219.40, 3,326.40 and 1,987.20 is: 2,978.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,219.40 : 3,326.40 = 1,987.20 : x
  2. Step 2: Convert to fraction form
    2,219.40/3,326.40 = 1,987.20/x
  3. Step 3: Cross multiply
    2,219.40x = 3,326.40 × 1,987.20
  4. Step 4: Simplify right side
    2,219.40x = 6,610,222.08
  5. Step 5: Solve for x
    x = 6,610,222.08/2,219.40
  6. Step 6: Final answer
    x = 2,978.38

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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.