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Finding the Fourth Proportional to 90,251.92, 135,378.15 and 31,086.82

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Solution

The fourth proportional to 90,251.92, 135,378.15 and 31,086.82 is: 46,630.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,251.92 : 135,378.15 = 31,086.82 : x
  2. Step 2: Convert to fraction form
    90,251.92/135,378.15 = 31,086.82/x
  3. Step 3: Cross multiply
    90,251.92x = 135,378.15 × 31,086.82
  4. Step 4: Simplify right side
    90,251.92x = 4,208,476,180.98
  5. Step 5: Solve for x
    x = 4,208,476,180.98/90,251.92
  6. Step 6: Final answer
    x = 46,630.32

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1.5x scale

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.