Home / 2,128.23-2,937.03-1,288.80

Finding the Fourth Proportional to 2,128.23, 2,937.03 and 1,288.80

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Solution

The fourth proportional to 2,128.23, 2,937.03 and 1,288.80 is: 1,778.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.23 : 2,937.03 = 1,288.80 : x
  2. Step 2: Convert to fraction form
    2,128.23/2,937.03 = 1,288.80/x
  3. Step 3: Cross multiply
    2,128.23x = 2,937.03 × 1,288.80
  4. Step 4: Simplify right side
    2,128.23x = 3,785,244.26
  5. Step 5: Solve for x
    x = 3,785,244.26/2,128.23
  6. Step 6: Final answer
    x = 1,778.59

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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.