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Finding the Fourth Proportional to 172,042.20, 257,945.40 and 87,638.94

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Solution

The fourth proportional to 172,042.20, 257,945.40 and 87,638.94 is: 131,398.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,042.20 : 257,945.40 = 87,638.94 : x
  2. Step 2: Convert to fraction form
    172,042.20/257,945.40 = 87,638.94/x
  3. Step 3: Cross multiply
    172,042.20x = 257,945.40 × 87,638.94
  4. Step 4: Simplify right side
    172,042.20x = 22,606,061,433.88
  5. Step 5: Solve for x
    x = 22,606,061,433.88/172,042.20
  6. Step 6: Final answer
    x = 131,398.35

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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.