Home / 1,221.12-1,818.32-1,203.66

Finding the Fourth Proportional to 1,221.12, 1,818.32 and 1,203.66

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Solution

The fourth proportional to 1,221.12, 1,818.32 and 1,203.66 is: 1,792.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.12 : 1,818.32 = 1,203.66 : x
  2. Step 2: Convert to fraction form
    1,221.12/1,818.32 = 1,203.66/x
  3. Step 3: Cross multiply
    1,221.12x = 1,818.32 × 1,203.66
  4. Step 4: Simplify right side
    1,221.12x = 2,188,633.03
  5. Step 5: Solve for x
    x = 2,188,633.03/1,221.12
  6. Step 6: Final answer
    x = 1,792.32

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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.