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Finding the Fourth Proportional to 138,879.70, 191,657.94 and 78,452.89

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Solution

The fourth proportional to 138,879.70, 191,657.94 and 78,452.89 is: 108,267.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,879.70 : 191,657.94 = 78,452.89 : x
  2. Step 2: Convert to fraction form
    138,879.70/191,657.94 = 78,452.89/x
  3. Step 3: Cross multiply
    138,879.70x = 191,657.94 × 78,452.89
  4. Step 4: Simplify right side
    138,879.70x = 15,036,118,805.30
  5. Step 5: Solve for x
    x = 15,036,118,805.30/138,879.70
  6. Step 6: Final answer
    x = 108,267.22

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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.