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Finding the Fourth Proportional to 168,921.40, 253,236.30 and 85,815.40

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Solution

The fourth proportional to 168,921.40, 253,236.30 and 85,815.40 is: 128,649.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    168,921.40 : 253,236.30 = 85,815.40 : x
  2. Step 2: Convert to fraction form
    168,921.40/253,236.30 = 85,815.40/x
  3. Step 3: Cross multiply
    168,921.40x = 253,236.30 × 85,815.40
  4. Step 4: Simplify right side
    168,921.40x = 21,731,574,379.02
  5. Step 5: Solve for x
    x = 21,731,574,379.02/168,921.40
  6. Step 6: Final answer
    x = 128,649.03

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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.