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Finding the Fourth Proportional to 139,390.34, 192,344.78 and 78,948.92

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Solution

The fourth proportional to 139,390.34, 192,344.78 and 78,948.92 is: 108,941.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,390.34 : 192,344.78 = 78,948.92 : x
  2. Step 2: Convert to fraction form
    139,390.34/192,344.78 = 78,948.92/x
  3. Step 3: Cross multiply
    139,390.34x = 192,344.78 × 78,948.92
  4. Step 4: Simplify right side
    139,390.34x = 15,185,412,648.64
  5. Step 5: Solve for x
    x = 15,185,412,648.64/139,390.34
  6. Step 6: Final answer
    x = 108,941.64

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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.