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Finding the Fourth Proportional to 168,921.90, 253,237.05 and 85,815.90

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Solution

The fourth proportional to 168,921.90, 253,237.05 and 85,815.90 is: 128,649.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    168,921.90 : 253,237.05 = 85,815.90 : x
  2. Step 2: Convert to fraction form
    168,921.90/253,237.05 = 85,815.90/x
  3. Step 3: Cross multiply
    168,921.90x = 253,237.05 × 85,815.90
  4. Step 4: Simplify right side
    168,921.90x = 21,731,765,359.10
  5. Step 5: Solve for x
    x = 21,731,765,359.10/168,921.90
  6. Step 6: Final answer
    x = 128,649.78

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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.