Home / 128,003.12-192,139.98-71,891.18

Finding the Fourth Proportional to 128,003.12, 192,139.98 and 71,891.18

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Solution

The fourth proportional to 128,003.12, 192,139.98 and 71,891.18 is: 107,912.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,003.12 : 192,139.98 = 71,891.18 : x
  2. Step 2: Convert to fraction form
    128,003.12/192,139.98 = 71,891.18/x
  3. Step 3: Cross multiply
    128,003.12x = 192,139.98 × 71,891.18
  4. Step 4: Simplify right side
    128,003.12x = 13,813,169,887.38
  5. Step 5: Solve for x
    x = 13,813,169,887.38/128,003.12
  6. Step 6: Final answer
    x = 107,912.76

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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.