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Finding the Fourth Proportional to 119,919, 165,490.86 and 66,203.88

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Solution

The fourth proportional to 119,919, 165,490.86 and 66,203.88 is: 91,362.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,919 : 165,490.86 = 66,203.88 : x
  2. Step 2: Convert to fraction form
    119,919/165,490.86 = 66,203.88/x
  3. Step 3: Cross multiply
    119,919x = 165,490.86 × 66,203.88
  4. Step 4: Simplify right side
    119,919x = 10,956,137,036.54
  5. Step 5: Solve for x
    x = 10,956,137,036.54/119,919
  6. Step 6: Final answer
    x = 91,362.81

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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.