Home / 2,114.40-3,187.60-1,989.12

Finding the Fourth Proportional to 2,114.40, 3,187.60 and 1,989.12

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Solution

The fourth proportional to 2,114.40, 3,187.60 and 1,989.12 is: 2,998.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,114.40 : 3,187.60 = 1,989.12 : x
  2. Step 2: Convert to fraction form
    2,114.40/3,187.60 = 1,989.12/x
  3. Step 3: Cross multiply
    2,114.40x = 3,187.60 × 1,989.12
  4. Step 4: Simplify right side
    2,114.40x = 6,340,518.91
  5. Step 5: Solve for x
    x = 6,340,518.91/2,114.40
  6. Step 6: Final answer
    x = 2,998.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.