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Finding the Fourth Proportional to 279,808.38, 419,772.54 and 90,279.54

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Solution

The fourth proportional to 279,808.38, 419,772.54 and 90,279.54 is: 135,438.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,808.38 : 419,772.54 = 90,279.54 : x
  2. Step 2: Convert to fraction form
    279,808.38/419,772.54 = 90,279.54/x
  3. Step 3: Cross multiply
    279,808.38x = 419,772.54 × 90,279.54
  4. Step 4: Simplify right side
    279,808.38x = 37,896,871,815.83
  5. Step 5: Solve for x
    x = 37,896,871,815.83/279,808.38
  6. Step 6: Final answer
    x = 135,438.66

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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.