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Finding the Fourth Proportional to 221,208.40, 331,920.60 and 102,818.80

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Solution

The fourth proportional to 221,208.40, 331,920.60 and 102,818.80 is: 154,278.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,208.40 : 331,920.60 = 102,818.80 : x
  2. Step 2: Convert to fraction form
    221,208.40/331,920.60 = 102,818.80/x
  3. Step 3: Cross multiply
    221,208.40x = 331,920.60 × 102,818.80
  4. Step 4: Simplify right side
    221,208.40x = 34,127,677,787.28
  5. Step 5: Solve for x
    x = 34,127,677,787.28/221,208.40
  6. Step 6: Final answer
    x = 154,278.40

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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.