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Finding the Fourth Proportional to 138,886.69, 191,662.73 and 78,476.89

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Solution

The fourth proportional to 138,886.69, 191,662.73 and 78,476.89 is: 108,297.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,886.69 : 191,662.73 = 78,476.89 : x
  2. Step 2: Convert to fraction form
    138,886.69/191,662.73 = 78,476.89/x
  3. Step 3: Cross multiply
    138,886.69x = 191,662.73 × 78,476.89
  4. Step 4: Simplify right side
    138,886.69x = 15,041,093,628.61
  5. Step 5: Solve for x
    x = 15,041,093,628.61/138,886.69
  6. Step 6: Final answer
    x = 108,297.59

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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.