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Finding the Fourth Proportional to 221,415.20, 332,122.80 and 81,155.60

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Solution

The fourth proportional to 221,415.20, 332,122.80 and 81,155.60 is: 121,733.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,415.20 : 332,122.80 = 81,155.60 : x
  2. Step 2: Convert to fraction form
    221,415.20/332,122.80 = 81,155.60/x
  3. Step 3: Cross multiply
    221,415.20x = 332,122.80 × 81,155.60
  4. Step 4: Simplify right side
    221,415.20x = 26,953,625,107.68
  5. Step 5: Solve for x
    x = 26,953,625,107.68/221,415.20
  6. Step 6: Final answer
    x = 121,733.40

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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.