Home / 2,119.95-3,179.19-821.07

Finding the Fourth Proportional to 2,119.95, 3,179.19 and 821.07

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Solution

The fourth proportional to 2,119.95, 3,179.19 and 821.07 is: 1,231.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.95 : 3,179.19 = 821.07 : x
  2. Step 2: Convert to fraction form
    2,119.95/3,179.19 = 821.07/x
  3. Step 3: Cross multiply
    2,119.95x = 3,179.19 × 821.07
  4. Step 4: Simplify right side
    2,119.95x = 2,610,337.53
  5. Step 5: Solve for x
    x = 2,610,337.53/2,119.95
  6. Step 6: Final answer
    x = 1,231.32

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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.