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Finding the Fourth Proportional to 136,335.70, 188,176.42 and 78,965.78

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Solution

The fourth proportional to 136,335.70, 188,176.42 and 78,965.78 is: 108,991.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,335.70 : 188,176.42 = 78,965.78 : x
  2. Step 2: Convert to fraction form
    136,335.70/188,176.42 = 78,965.78/x
  3. Step 3: Cross multiply
    136,335.70x = 188,176.42 × 78,965.78
  4. Step 4: Simplify right side
    136,335.70x = 14,859,497,782.91
  5. Step 5: Solve for x
    x = 14,859,497,782.91/136,335.70
  6. Step 6: Final answer
    x = 108,991.98

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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.