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Finding the Fourth Proportional to 139,394.62, 192,374.09 and 78,965.76

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Solution

The fourth proportional to 139,394.62, 192,374.09 and 78,965.76 is: 108,978.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,394.62 : 192,374.09 = 78,965.76 : x
  2. Step 2: Convert to fraction form
    139,394.62/192,374.09 = 78,965.76/x
  3. Step 3: Cross multiply
    139,394.62x = 192,374.09 × 78,965.76
  4. Step 4: Simplify right side
    139,394.62x = 15,190,966,418.57
  5. Step 5: Solve for x
    x = 15,190,966,418.57/139,394.62
  6. Step 6: Final answer
    x = 108,978.14

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1.5x scale

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.