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Finding the Fourth Proportional to 138,992.96, 191,805.12 and 75,329.36

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Solution

The fourth proportional to 138,992.96, 191,805.12 and 75,329.36 is: 103,951.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,992.96 : 191,805.12 = 75,329.36 : x
  2. Step 2: Convert to fraction form
    138,992.96/191,805.12 = 75,329.36/x
  3. Step 3: Cross multiply
    138,992.96x = 191,805.12 × 75,329.36
  4. Step 4: Simplify right side
    138,992.96x = 14,448,556,934.32
  5. Step 5: Solve for x
    x = 14,448,556,934.32/138,992.96
  6. Step 6: Final answer
    x = 103,951.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.