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Finding the Fourth Proportional to 279,678.84, 419,517.95 and 69,316.79

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Solution

The fourth proportional to 279,678.84, 419,517.95 and 69,316.79 is: 103,975.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,678.84 : 419,517.95 = 69,316.79 : x
  2. Step 2: Convert to fraction form
    279,678.84/419,517.95 = 69,316.79/x
  3. Step 3: Cross multiply
    279,678.84x = 419,517.95 × 69,316.79
  4. Step 4: Simplify right side
    279,678.84x = 29,079,635,197.21
  5. Step 5: Solve for x
    x = 29,079,635,197.21/279,678.84
  6. Step 6: Final answer
    x = 103,975.10

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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.