Home / 1,331.38-1,983-1,261.98

Finding the Fourth Proportional to 1,331.38, 1,983 and 1,261.98

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Solution

The fourth proportional to 1,331.38, 1,983 and 1,261.98 is: 1,879.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.38 : 1,983 = 1,261.98 : x
  2. Step 2: Convert to fraction form
    1,331.38/1,983 = 1,261.98/x
  3. Step 3: Cross multiply
    1,331.38x = 1,983 × 1,261.98
  4. Step 4: Simplify right side
    1,331.38x = 2,502,506.34
  5. Step 5: Solve for x
    x = 2,502,506.34/1,331.38
  6. Step 6: Final answer
    x = 1,879.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.