Home / 1,257.40-1,876.01-1,118.80

Finding the Fourth Proportional to 1,257.40, 1,876.01 and 1,118.80

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Solution

The fourth proportional to 1,257.40, 1,876.01 and 1,118.80 is: 1,669.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.40 : 1,876.01 = 1,118.80 : x
  2. Step 2: Convert to fraction form
    1,257.40/1,876.01 = 1,118.80/x
  3. Step 3: Cross multiply
    1,257.40x = 1,876.01 × 1,118.80
  4. Step 4: Simplify right side
    1,257.40x = 2,098,879.99
  5. Step 5: Solve for x
    x = 2,098,879.99/1,257.40
  6. Step 6: Final answer
    x = 1,669.22

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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.