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Finding the Fourth Proportional to 128,936.93, 193,405.12 and 72,751.55

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Solution

The fourth proportional to 128,936.93, 193,405.12 and 72,751.55 is: 109,127.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,936.93 : 193,405.12 = 72,751.55 : x
  2. Step 2: Convert to fraction form
    128,936.93/193,405.12 = 72,751.55/x
  3. Step 3: Cross multiply
    128,936.93x = 193,405.12 × 72,751.55
  4. Step 4: Simplify right side
    128,936.93x = 14,070,522,257.94
  5. Step 5: Solve for x
    x = 14,070,522,257.94/128,936.93
  6. Step 6: Final answer
    x = 109,127.17

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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.