Home / 2,140.42-3,211.80-1,489.90

Finding the Fourth Proportional to 2,140.42, 3,211.80 and 1,489.90

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Solution

The fourth proportional to 2,140.42, 3,211.80 and 1,489.90 is: 2,235.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.42 : 3,211.80 = 1,489.90 : x
  2. Step 2: Convert to fraction form
    2,140.42/3,211.80 = 1,489.90/x
  3. Step 3: Cross multiply
    2,140.42x = 3,211.80 × 1,489.90
  4. Step 4: Simplify right side
    2,140.42x = 4,785,260.82
  5. Step 5: Solve for x
    x = 4,785,260.82/2,140.42
  6. Step 6: Final answer
    x = 2,235.66

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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.