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Finding the Fourth Proportional to 128,722.38, 193,081.14 and 39,973.92

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Solution

The fourth proportional to 128,722.38, 193,081.14 and 39,973.92 is: 59,960.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,722.38 : 193,081.14 = 39,973.92 : x
  2. Step 2: Convert to fraction form
    128,722.38/193,081.14 = 39,973.92/x
  3. Step 3: Cross multiply
    128,722.38x = 193,081.14 × 39,973.92
  4. Step 4: Simplify right side
    128,722.38x = 7,718,210,043.87
  5. Step 5: Solve for x
    x = 7,718,210,043.87/128,722.38
  6. Step 6: Final answer
    x = 59,960.13

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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.