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Finding the Fourth Proportional to 138,892, 191,696.88 and 79,276

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Solution

The fourth proportional to 138,892, 191,696.88 and 79,276 is: 109,415.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,892 : 191,696.88 = 79,276 : x
  2. Step 2: Convert to fraction form
    138,892/191,696.88 = 79,276/x
  3. Step 3: Cross multiply
    138,892x = 191,696.88 × 79,276
  4. Step 4: Simplify right side
    138,892x = 15,196,961,858.88
  5. Step 5: Solve for x
    x = 15,196,961,858.88/138,892
  6. Step 6: Final answer
    x = 109,415.67

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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.