Home / 128,257.92-192,211.20-72,125.28

Finding the Fourth Proportional to 128,257.92, 192,211.20 and 72,125.28

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Solution

The fourth proportional to 128,257.92, 192,211.20 and 72,125.28 is: 108,089.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,257.92 : 192,211.20 = 72,125.28 : x
  2. Step 2: Convert to fraction form
    128,257.92/192,211.20 = 72,125.28/x
  3. Step 3: Cross multiply
    128,257.92x = 192,211.20 × 72,125.28
  4. Step 4: Simplify right side
    128,257.92x = 13,863,286,619.14
  5. Step 5: Solve for x
    x = 13,863,286,619.14/128,257.92
  6. Step 6: Final answer
    x = 108,089.13

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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.