Home / 2,128.32-3,188.64-1,781.28

Finding the Fourth Proportional to 2,128.32, 3,188.64 and 1,781.28

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Solution

The fourth proportional to 2,128.32, 3,188.64 and 1,781.28 is: 2,668.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.32 : 3,188.64 = 1,781.28 : x
  2. Step 2: Convert to fraction form
    2,128.32/3,188.64 = 1,781.28/x
  3. Step 3: Cross multiply
    2,128.32x = 3,188.64 × 1,781.28
  4. Step 4: Simplify right side
    2,128.32x = 5,679,860.66
  5. Step 5: Solve for x
    x = 5,679,860.66/2,128.32
  6. Step 6: Final answer
    x = 2,668.71

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1.5x scale

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.