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Finding the Fourth Proportional to 139,203.78, 192,101.12 and 78,773.33

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Solution

The fourth proportional to 139,203.78, 192,101.12 and 78,773.33 is: 108,707.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,203.78 : 192,101.12 = 78,773.33 : x
  2. Step 2: Convert to fraction form
    139,203.78/192,101.12 = 78,773.33/x
  3. Step 3: Cross multiply
    139,203.78x = 192,101.12 × 78,773.33
  4. Step 4: Simplify right side
    139,203.78x = 15,132,444,220.35
  5. Step 5: Solve for x
    x = 15,132,444,220.35/139,203.78
  6. Step 6: Final answer
    x = 108,707.13

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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.