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Finding the Fourth Proportional to 90,143.28, 124,259.67 and 67,447.89

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Solution

The fourth proportional to 90,143.28, 124,259.67 and 67,447.89 is: 92,974.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,143.28 : 124,259.67 = 67,447.89 : x
  2. Step 2: Convert to fraction form
    90,143.28/124,259.67 = 67,447.89/x
  3. Step 3: Cross multiply
    90,143.28x = 124,259.67 × 67,447.89
  4. Step 4: Simplify right side
    90,143.28x = 8,381,052,553.60
  5. Step 5: Solve for x
    x = 8,381,052,553.60/90,143.28
  6. Step 6: Final answer
    x = 92,974.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.