Home / 2,219.80-3,330.60-921.40

Finding the Fourth Proportional to 2,219.80, 3,330.60 and 921.40

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Solution

The fourth proportional to 2,219.80, 3,330.60 and 921.40 is: 1,382.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,219.80 : 3,330.60 = 921.40 : x
  2. Step 2: Convert to fraction form
    2,219.80/3,330.60 = 921.40/x
  3. Step 3: Cross multiply
    2,219.80x = 3,330.60 × 921.40
  4. Step 4: Simplify right side
    2,219.80x = 3,068,814.84
  5. Step 5: Solve for x
    x = 3,068,814.84/2,219.80
  6. Step 6: Final answer
    x = 1,382.47

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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.