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Finding the Fourth Proportional to 136,586.80, 205,046.60 and 86,666.80

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Solution

The fourth proportional to 136,586.80, 205,046.60 and 86,666.80 is: 130,105.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,586.80 : 205,046.60 = 86,666.80 : x
  2. Step 2: Convert to fraction form
    136,586.80/205,046.60 = 86,666.80/x
  3. Step 3: Cross multiply
    136,586.80x = 205,046.60 × 86,666.80
  4. Step 4: Simplify right side
    136,586.80x = 17,770,732,672.88
  5. Step 5: Solve for x
    x = 17,770,732,672.88/136,586.80
  6. Step 6: Final answer
    x = 130,105.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.