Home / 1,221.48-1,821.36-1,199.64

Finding the Fourth Proportional to 1,221.48, 1,821.36 and 1,199.64

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Solution

The fourth proportional to 1,221.48, 1,821.36 and 1,199.64 is: 1,788.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.48 : 1,821.36 = 1,199.64 : x
  2. Step 2: Convert to fraction form
    1,221.48/1,821.36 = 1,199.64/x
  3. Step 3: Cross multiply
    1,221.48x = 1,821.36 × 1,199.64
  4. Step 4: Simplify right side
    1,221.48x = 2,184,976.31
  5. Step 5: Solve for x
    x = 2,184,976.31/1,221.48
  6. Step 6: Final answer
    x = 1,788.79

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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.