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Finding the Fourth Proportional to 279,990.92, 419,988 and 69,628.88

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Solution

The fourth proportional to 279,990.92, 419,988 and 69,628.88 is: 104,443.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,990.92 : 419,988 = 69,628.88 : x
  2. Step 2: Convert to fraction form
    279,990.92/419,988 = 69,628.88/x
  3. Step 3: Cross multiply
    279,990.92x = 419,988 × 69,628.88
  4. Step 4: Simplify right side
    279,990.92x = 29,243,294,053.44
  5. Step 5: Solve for x
    x = 29,243,294,053.44/279,990.92
  6. Step 6: Final answer
    x = 104,443.72

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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.