Home / 2,139.23-3,187.70-1,921.20

Finding the Fourth Proportional to 2,139.23, 3,187.70 and 1,921.20

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Solution

The fourth proportional to 2,139.23, 3,187.70 and 1,921.20 is: 2,862.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.23 : 3,187.70 = 1,921.20 : x
  2. Step 2: Convert to fraction form
    2,139.23/3,187.70 = 1,921.20/x
  3. Step 3: Cross multiply
    2,139.23x = 3,187.70 × 1,921.20
  4. Step 4: Simplify right side
    2,139.23x = 6,124,199.63
  5. Step 5: Solve for x
    x = 6,124,199.63/2,139.23
  6. Step 6: Final answer
    x = 2,862.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.