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Finding the Fourth Proportional to 2,150.40, 3,218.40 and 1,891.20

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Solution

The fourth proportional to 2,150.40, 3,218.40 and 1,891.20 is: 2,830.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,150.40 : 3,218.40 = 1,891.20 : x
  2. Step 2: Convert to fraction form
    2,150.40/3,218.40 = 1,891.20/x
  3. Step 3: Cross multiply
    2,150.40x = 3,218.40 × 1,891.20
  4. Step 4: Simplify right side
    2,150.40x = 6,086,638.08
  5. Step 5: Solve for x
    x = 6,086,638.08/2,150.40
  6. Step 6: Final answer
    x = 2,830.47

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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.