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Finding the Fourth Proportional to 139,383.86, 192,349.96 and 75,721.72

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Solution

The fourth proportional to 139,383.86, 192,349.96 and 75,721.72 is: 104,496.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,383.86 : 192,349.96 = 75,721.72 : x
  2. Step 2: Convert to fraction form
    139,383.86/192,349.96 = 75,721.72/x
  3. Step 3: Cross multiply
    139,383.86x = 192,349.96 × 75,721.72
  4. Step 4: Simplify right side
    139,383.86x = 14,565,069,813.13
  5. Step 5: Solve for x
    x = 14,565,069,813.13/139,383.86
  6. Step 6: Final answer
    x = 104,496.10

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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.