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Finding the Fourth Proportional to 139,398.10, 192,369.84 and 78,979.93

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Solution

The fourth proportional to 139,398.10, 192,369.84 and 78,979.93 is: 108,992.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,398.10 : 192,369.84 = 78,979.93 : x
  2. Step 2: Convert to fraction form
    139,398.10/192,369.84 = 78,979.93/x
  3. Step 3: Cross multiply
    139,398.10x = 192,369.84 × 78,979.93
  4. Step 4: Simplify right side
    139,398.10x = 15,193,356,497.31
  5. Step 5: Solve for x
    x = 15,193,356,497.31/139,398.10
  6. Step 6: Final answer
    x = 108,992.57

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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.