Home / 1,221.13-1,831.75-355.45

Finding the Fourth Proportional to 1,221.13, 1,831.75 and 355.45

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Solution

The fourth proportional to 1,221.13, 1,831.75 and 355.45 is: 533.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.13 : 1,831.75 = 355.45 : x
  2. Step 2: Convert to fraction form
    1,221.13/1,831.75 = 355.45/x
  3. Step 3: Cross multiply
    1,221.13x = 1,831.75 × 355.45
  4. Step 4: Simplify right side
    1,221.13x = 651,086.38
  5. Step 5: Solve for x
    x = 651,086.38/1,221.13
  6. Step 6: Final answer
    x = 533.18

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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.