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Finding the Fourth Proportional to 1,221.23, 1,831.70 and 355.54

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Solution

The fourth proportional to 1,221.23, 1,831.70 and 355.54 is: 533.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.23 : 1,831.70 = 355.54 : x
  2. Step 2: Convert to fraction form
    1,221.23/1,831.70 = 355.54/x
  3. Step 3: Cross multiply
    1,221.23x = 1,831.70 × 355.54
  4. Step 4: Simplify right side
    1,221.23x = 651,238.93
  5. Step 5: Solve for x
    x = 651,238.93/1,221.23
  6. Step 6: Final answer
    x = 533.27

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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.