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Finding the Fourth Proportional to 279,607.12, 419,340.30 and 79,928.56

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Solution

The fourth proportional to 279,607.12, 419,340.30 and 79,928.56 is: 119,872.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,607.12 : 419,340.30 = 79,928.56 : x
  2. Step 2: Convert to fraction form
    279,607.12/419,340.30 = 79,928.56/x
  3. Step 3: Cross multiply
    279,607.12x = 419,340.30 × 79,928.56
  4. Step 4: Simplify right side
    279,607.12x = 33,517,266,328.97
  5. Step 5: Solve for x
    x = 33,517,266,328.97/279,607.12
  6. Step 6: Final answer
    x = 119,872.72

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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.