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Finding the Fourth Proportional to 138,636.76, 191,309.82 and 79,016.92

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Solution

The fourth proportional to 138,636.76, 191,309.82 and 79,016.92 is: 109,038.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,636.76 : 191,309.82 = 79,016.92 : x
  2. Step 2: Convert to fraction form
    138,636.76/191,309.82 = 79,016.92/x
  3. Step 3: Cross multiply
    138,636.76x = 191,309.82 × 79,016.92
  4. Step 4: Simplify right side
    138,636.76x = 15,116,712,742.15
  5. Step 5: Solve for x
    x = 15,116,712,742.15/138,636.76
  6. Step 6: Final answer
    x = 109,038.27

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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.