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Finding the Fourth Proportional to 139,394.84, 192,322.50 and 78,955.88

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Solution

The fourth proportional to 139,394.84, 192,322.50 and 78,955.88 is: 108,935.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,394.84 : 192,322.50 = 78,955.88 : x
  2. Step 2: Convert to fraction form
    139,394.84/192,322.50 = 78,955.88/x
  3. Step 3: Cross multiply
    139,394.84x = 192,322.50 × 78,955.88
  4. Step 4: Simplify right side
    139,394.84x = 15,184,992,231.30
  5. Step 5: Solve for x
    x = 15,184,992,231.30/139,394.84
  6. Step 6: Final answer
    x = 108,935.11

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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.