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Finding the Fourth Proportional to 221,920.40, 332,929.20 and 72,135.20

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Solution

The fourth proportional to 221,920.40, 332,929.20 and 72,135.20 is: 108,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,920.40 : 332,929.20 = 72,135.20 : x
  2. Step 2: Convert to fraction form
    221,920.40/332,929.20 = 72,135.20/x
  3. Step 3: Cross multiply
    221,920.40x = 332,929.20 × 72,135.20
  4. Step 4: Simplify right side
    221,920.40x = 24,015,914,427.84
  5. Step 5: Solve for x
    x = 24,015,914,427.84/221,920.40
  6. Step 6: Final answer
    x = 108,218.60

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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.