Home / 1,221.18-1,831.95-355.56

Finding the Fourth Proportional to 1,221.18, 1,831.95 and 355.56

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Solution

The fourth proportional to 1,221.18, 1,831.95 and 355.56 is: 533.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.18 : 1,831.95 = 355.56 : x
  2. Step 2: Convert to fraction form
    1,221.18/1,831.95 = 355.56/x
  3. Step 3: Cross multiply
    1,221.18x = 1,831.95 × 355.56
  4. Step 4: Simplify right side
    1,221.18x = 651,368.14
  5. Step 5: Solve for x
    x = 651,368.14/1,221.18
  6. Step 6: Final answer
    x = 533.39

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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.