Home / 1,284.20-1,921.60-1,112.88

Finding the Fourth Proportional to 1,284.20, 1,921.60 and 1,112.88

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Solution

The fourth proportional to 1,284.20, 1,921.60 and 1,112.88 is: 1,665.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.20 : 1,921.60 = 1,112.88 : x
  2. Step 2: Convert to fraction form
    1,284.20/1,921.60 = 1,112.88/x
  3. Step 3: Cross multiply
    1,284.20x = 1,921.60 × 1,112.88
  4. Step 4: Simplify right side
    1,284.20x = 2,138,510.21
  5. Step 5: Solve for x
    x = 2,138,510.21/1,284.20
  6. Step 6: Final answer
    x = 1,665.25

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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.