Home / 2,128.15-3,190.20-1,909.45

Finding the Fourth Proportional to 2,128.15, 3,190.20 and 1,909.45

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Solution

The fourth proportional to 2,128.15, 3,190.20 and 1,909.45 is: 2,862.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.15 : 3,190.20 = 1,909.45 : x
  2. Step 2: Convert to fraction form
    2,128.15/3,190.20 = 1,909.45/x
  3. Step 3: Cross multiply
    2,128.15x = 3,190.20 × 1,909.45
  4. Step 4: Simplify right side
    2,128.15x = 6,091,527.39
  5. Step 5: Solve for x
    x = 6,091,527.39/2,128.15
  6. Step 6: Final answer
    x = 2,862.36

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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.