Home / 1,421.36-1,960.19-1,118.66

Finding the Fourth Proportional to 1,421.36, 1,960.19 and 1,118.66

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Solution

The fourth proportional to 1,421.36, 1,960.19 and 1,118.66 is: 1,542.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.36 : 1,960.19 = 1,118.66 : x
  2. Step 2: Convert to fraction form
    1,421.36/1,960.19 = 1,118.66/x
  3. Step 3: Cross multiply
    1,421.36x = 1,960.19 × 1,118.66
  4. Step 4: Simplify right side
    1,421.36x = 2,192,770.75
  5. Step 5: Solve for x
    x = 2,192,770.75/1,421.36
  6. Step 6: Final answer
    x = 1,542.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.