Home / 2,101.20-3,151.80-1,371.60

Finding the Fourth Proportional to 2,101.20, 3,151.80 and 1,371.60

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Solution

The fourth proportional to 2,101.20, 3,151.80 and 1,371.60 is: 2,057.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.20 : 3,151.80 = 1,371.60 : x
  2. Step 2: Convert to fraction form
    2,101.20/3,151.80 = 1,371.60/x
  3. Step 3: Cross multiply
    2,101.20x = 3,151.80 × 1,371.60
  4. Step 4: Simplify right side
    2,101.20x = 4,323,008.88
  5. Step 5: Solve for x
    x = 4,323,008.88/2,101.20
  6. Step 6: Final answer
    x = 2,057.40

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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.