Home / 2,128.48-2,936.13-1,289.44

Finding the Fourth Proportional to 2,128.48, 2,936.13 and 1,289.44

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Solution

The fourth proportional to 2,128.48, 2,936.13 and 1,289.44 is: 1,778.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.48 : 2,936.13 = 1,289.44 : x
  2. Step 2: Convert to fraction form
    2,128.48/2,936.13 = 1,289.44/x
  3. Step 3: Cross multiply
    2,128.48x = 2,936.13 × 1,289.44
  4. Step 4: Simplify right side
    2,128.48x = 3,785,963.47
  5. Step 5: Solve for x
    x = 3,785,963.47/2,128.48
  6. Step 6: Final answer
    x = 1,778.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.