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Finding the Fourth Proportional to 138,336.86, 207,246.95 and 78,992.62

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Solution

The fourth proportional to 138,336.86, 207,246.95 and 78,992.62 is: 118,341.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,336.86 : 207,246.95 = 78,992.62 : x
  2. Step 2: Convert to fraction form
    138,336.86/207,246.95 = 78,992.62/x
  3. Step 3: Cross multiply
    138,336.86x = 207,246.95 × 78,992.62
  4. Step 4: Simplify right side
    138,336.86x = 16,370,979,394.98
  5. Step 5: Solve for x
    x = 16,370,979,394.98/138,336.86
  6. Step 6: Final answer
    x = 118,341.41

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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.