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Finding the Fourth Proportional to 217,164.60, 325,659.42 and 90,721.98

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Solution

The fourth proportional to 217,164.60, 325,659.42 and 90,721.98 is: 136,046.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,164.60 : 325,659.42 = 90,721.98 : x
  2. Step 2: Convert to fraction form
    217,164.60/325,659.42 = 90,721.98/x
  3. Step 3: Cross multiply
    217,164.60x = 325,659.42 × 90,721.98
  4. Step 4: Simplify right side
    217,164.60x = 29,544,467,388.05
  5. Step 5: Solve for x
    x = 29,544,467,388.05/217,164.60
  6. Step 6: Final answer
    x = 136,046.42

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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.