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Finding the Fourth Proportional to 253,679.87, 380,529.07 and 85,205.75

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Solution

The fourth proportional to 253,679.87, 380,529.07 and 85,205.75 is: 127,811.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    253,679.87 : 380,529.07 = 85,205.75 : x
  2. Step 2: Convert to fraction form
    253,679.87/380,529.07 = 85,205.75/x
  3. Step 3: Cross multiply
    253,679.87x = 380,529.07 × 85,205.75
  4. Step 4: Simplify right side
    253,679.87x = 32,423,262,690.49
  5. Step 5: Solve for x
    x = 32,423,262,690.49/253,679.87
  6. Step 6: Final answer
    x = 127,811.73

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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.