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Finding the Fourth Proportional to 138,629.76, 191,300.16 and 79,009.92

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Solution

The fourth proportional to 138,629.76, 191,300.16 and 79,009.92 is: 109,028.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,629.76 : 191,300.16 = 79,009.92 : x
  2. Step 2: Convert to fraction form
    138,629.76/191,300.16 = 79,009.92/x
  3. Step 3: Cross multiply
    138,629.76x = 191,300.16 × 79,009.92
  4. Step 4: Simplify right side
    138,629.76x = 15,114,610,337.59
  5. Step 5: Solve for x
    x = 15,114,610,337.59/138,629.76
  6. Step 6: Final answer
    x = 109,028.61

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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.