Home / 1,284.38-1,917.27-1,128.68

Finding the Fourth Proportional to 1,284.38, 1,917.27 and 1,128.68

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Solution

The fourth proportional to 1,284.38, 1,917.27 and 1,128.68 is: 1,684.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.38 : 1,917.27 = 1,128.68 : x
  2. Step 2: Convert to fraction form
    1,284.38/1,917.27 = 1,128.68/x
  3. Step 3: Cross multiply
    1,284.38x = 1,917.27 × 1,128.68
  4. Step 4: Simplify right side
    1,284.38x = 2,163,984.30
  5. Step 5: Solve for x
    x = 2,163,984.30/1,284.38
  6. Step 6: Final answer
    x = 1,684.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.