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Finding the Fourth Proportional to 278,726.43, 418,089.51 and 79,048.56

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Solution

The fourth proportional to 278,726.43, 418,089.51 and 79,048.56 is: 118,572.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,726.43 : 418,089.51 = 79,048.56 : x
  2. Step 2: Convert to fraction form
    278,726.43/418,089.51 = 79,048.56/x
  3. Step 3: Cross multiply
    278,726.43x = 418,089.51 × 79,048.56
  4. Step 4: Simplify right side
    278,726.43x = 33,049,373,716.61
  5. Step 5: Solve for x
    x = 33,049,373,716.61/278,726.43
  6. Step 6: Final answer
    x = 118,572.80

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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.