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Finding the Fourth Proportional to 137,379.45, 206,128.44 and 74,187

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Solution

The fourth proportional to 137,379.45, 206,128.44 and 74,187 is: 111,312.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,379.45 : 206,128.44 = 74,187 : x
  2. Step 2: Convert to fraction form
    137,379.45/206,128.44 = 74,187/x
  3. Step 3: Cross multiply
    137,379.45x = 206,128.44 × 74,187
  4. Step 4: Simplify right side
    137,379.45x = 15,292,050,578.28
  5. Step 5: Solve for x
    x = 15,292,050,578.28/137,379.45
  6. Step 6: Final answer
    x = 111,312.50

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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.