Home / 1,221.26-1,831.58-355.40

Finding the Fourth Proportional to 1,221.26, 1,831.58 and 355.40

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Solution

The fourth proportional to 1,221.26, 1,831.58 and 355.40 is: 533.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.26 : 1,831.58 = 355.40 : x
  2. Step 2: Convert to fraction form
    1,221.26/1,831.58 = 355.40/x
  3. Step 3: Cross multiply
    1,221.26x = 1,831.58 × 355.40
  4. Step 4: Simplify right side
    1,221.26x = 650,943.53
  5. Step 5: Solve for x
    x = 650,943.53/1,221.26
  6. Step 6: Final answer
    x = 533.01

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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.