Home / 1,661.80-2,488.30-1,331.20

Finding the Fourth Proportional to 1,661.80, 2,488.30 and 1,331.20

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Solution

The fourth proportional to 1,661.80, 2,488.30 and 1,331.20 is: 1,993.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.80 : 2,488.30 = 1,331.20 : x
  2. Step 2: Convert to fraction form
    1,661.80/2,488.30 = 1,331.20/x
  3. Step 3: Cross multiply
    1,661.80x = 2,488.30 × 1,331.20
  4. Step 4: Simplify right side
    1,661.80x = 3,312,424.96
  5. Step 5: Solve for x
    x = 3,312,424.96/1,661.80
  6. Step 6: Final answer
    x = 1,993.28

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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.