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Finding the Fourth Proportional to 128,995.65, 193,568.13 and 54,109.08

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Solution

The fourth proportional to 128,995.65, 193,568.13 and 54,109.08 is: 81,194.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,995.65 : 193,568.13 = 54,109.08 : x
  2. Step 2: Convert to fraction form
    128,995.65/193,568.13 = 54,109.08/x
  3. Step 3: Cross multiply
    128,995.65x = 193,568.13 × 54,109.08
  4. Step 4: Simplify right side
    128,995.65x = 10,473,793,431.62
  5. Step 5: Solve for x
    x = 10,473,793,431.62/128,995.65
  6. Step 6: Final answer
    x = 81,194.94

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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.