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Finding the Fourth Proportional to 138,709.96, 191,419.68 and 78,293.28

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Solution

The fourth proportional to 138,709.96, 191,419.68 and 78,293.28 is: 108,044.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,709.96 : 191,419.68 = 78,293.28 : x
  2. Step 2: Convert to fraction form
    138,709.96/191,419.68 = 78,293.28/x
  3. Step 3: Cross multiply
    138,709.96x = 191,419.68 × 78,293.28
  4. Step 4: Simplify right side
    138,709.96x = 14,986,874,603.75
  5. Step 5: Solve for x
    x = 14,986,874,603.75/138,709.96
  6. Step 6: Final answer
    x = 108,044.69

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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.