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Finding the Fourth Proportional to 138,790, 191,530.20 and 79,174

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Solution

The fourth proportional to 138,790, 191,530.20 and 79,174 is: 109,260.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,790 : 191,530.20 = 79,174 : x
  2. Step 2: Convert to fraction form
    138,790/191,530.20 = 79,174/x
  3. Step 3: Cross multiply
    138,790x = 191,530.20 × 79,174
  4. Step 4: Simplify right side
    138,790x = 15,164,212,054.80
  5. Step 5: Solve for x
    x = 15,164,212,054.80/138,790
  6. Step 6: Final answer
    x = 109,260.12

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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.