Home / 1,489.80-2,238.30-1,331.40

Finding the Fourth Proportional to 1,489.80, 2,238.30 and 1,331.40

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Solution

The fourth proportional to 1,489.80, 2,238.30 and 1,331.40 is: 2,000.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.80 : 2,238.30 = 1,331.40 : x
  2. Step 2: Convert to fraction form
    1,489.80/2,238.30 = 1,331.40/x
  3. Step 3: Cross multiply
    1,489.80x = 2,238.30 × 1,331.40
  4. Step 4: Simplify right side
    1,489.80x = 2,980,072.62
  5. Step 5: Solve for x
    x = 2,980,072.62/1,489.80
  6. Step 6: Final answer
    x = 2,000.32

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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.