Home / 1,221.36-1,831.56-636.18

Finding the Fourth Proportional to 1,221.36, 1,831.56 and 636.18

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Solution

The fourth proportional to 1,221.36, 1,831.56 and 636.18 is: 954.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.36 : 1,831.56 = 636.18 : x
  2. Step 2: Convert to fraction form
    1,221.36/1,831.56 = 636.18/x
  3. Step 3: Cross multiply
    1,221.36x = 1,831.56 × 636.18
  4. Step 4: Simplify right side
    1,221.36x = 1,165,201.84
  5. Step 5: Solve for x
    x = 1,165,201.84/1,221.36
  6. Step 6: Final answer
    x = 954.02

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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.