Home / 1,221.78-1,831.05-1,091.64

Finding the Fourth Proportional to 1,221.78, 1,831.05 and 1,091.64

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Solution

The fourth proportional to 1,221.78, 1,831.05 and 1,091.64 is: 1,636.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.78 : 1,831.05 = 1,091.64 : x
  2. Step 2: Convert to fraction form
    1,221.78/1,831.05 = 1,091.64/x
  3. Step 3: Cross multiply
    1,221.78x = 1,831.05 × 1,091.64
  4. Step 4: Simplify right side
    1,221.78x = 1,998,847.42
  5. Step 5: Solve for x
    x = 1,998,847.42/1,221.78
  6. Step 6: Final answer
    x = 1,636.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.