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Finding the Fourth Proportional to 278,841.45, 418,263.57 and 68,479.41

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Solution

The fourth proportional to 278,841.45, 418,263.57 and 68,479.41 is: 102,719.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,841.45 : 418,263.57 = 68,479.41 : x
  2. Step 2: Convert to fraction form
    278,841.45/418,263.57 = 68,479.41/x
  3. Step 3: Cross multiply
    278,841.45x = 418,263.57 × 68,479.41
  4. Step 4: Simplify right side
    278,841.45x = 28,642,442,498.09
  5. Step 5: Solve for x
    x = 28,642,442,498.09/278,841.45
  6. Step 6: Final answer
    x = 102,719.46

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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.