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Finding the Fourth Proportional to 138,879.08, 191,656.68 and 85,193.72

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Solution

The fourth proportional to 138,879.08, 191,656.68 and 85,193.72 is: 117,569.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,879.08 : 191,656.68 = 85,193.72 : x
  2. Step 2: Convert to fraction form
    138,879.08/191,656.68 = 85,193.72/x
  3. Step 3: Cross multiply
    138,879.08x = 191,656.68 × 85,193.72
  4. Step 4: Simplify right side
    138,879.08x = 16,327,945,532.05
  5. Step 5: Solve for x
    x = 16,327,945,532.05/138,879.08
  6. Step 6: Final answer
    x = 117,569.51

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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.