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Finding the Fourth Proportional to 278,940.80, 418,411.20 and 278,940.80

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Solution

The fourth proportional to 278,940.80, 418,411.20 and 278,940.80 is: 418,411.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,940.80 : 418,411.20 = 278,940.80 : x
  2. Step 2: Convert to fraction form
    278,940.80/418,411.20 = 278,940.80/x
  3. Step 3: Cross multiply
    278,940.80x = 418,411.20 × 278,940.80
  4. Step 4: Simplify right side
    278,940.80x = 116,711,954,856.96
  5. Step 5: Solve for x
    x = 116,711,954,856.96/278,940.80
  6. Step 6: Final answer
    x = 418,411.20

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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.