Home / 1,418.40-1,956.24-1,221.12

Finding the Fourth Proportional to 1,418.40, 1,956.24 and 1,221.12

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Solution

The fourth proportional to 1,418.40, 1,956.24 and 1,221.12 is: 1,684.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.40 : 1,956.24 = 1,221.12 : x
  2. Step 2: Convert to fraction form
    1,418.40/1,956.24 = 1,221.12/x
  3. Step 3: Cross multiply
    1,418.40x = 1,956.24 × 1,221.12
  4. Step 4: Simplify right side
    1,418.40x = 2,388,803.79
  5. Step 5: Solve for x
    x = 2,388,803.79/1,418.40
  6. Step 6: Final answer
    x = 1,684.15

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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.