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Finding the Fourth Proportional to 278,840.70, 418,262.45 and 68,478.66

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Solution

The fourth proportional to 278,840.70, 418,262.45 and 68,478.66 is: 102,718.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,840.70 : 418,262.45 = 68,478.66 : x
  2. Step 2: Convert to fraction form
    278,840.70/418,262.45 = 68,478.66/x
  3. Step 3: Cross multiply
    278,840.70x = 418,262.45 × 68,478.66
  4. Step 4: Simplify right side
    278,840.70x = 28,642,051,761.92
  5. Step 5: Solve for x
    x = 28,642,051,761.92/278,840.70
  6. Step 6: Final answer
    x = 102,718.33

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1.5x scale

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.