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Finding the Fourth Proportional to 171,638.61, 257,122.72 and 81,553.11

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Solution

The fourth proportional to 171,638.61, 257,122.72 and 81,553.11 is: 122,170.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,638.61 : 257,122.72 = 81,553.11 : x
  2. Step 2: Convert to fraction form
    171,638.61/257,122.72 = 81,553.11/x
  3. Step 3: Cross multiply
    171,638.61x = 257,122.72 × 81,553.11
  4. Step 4: Simplify right side
    171,638.61x = 20,969,157,467.66
  5. Step 5: Solve for x
    x = 20,969,157,467.66/171,638.61
  6. Step 6: Final answer
    x = 122,170.40

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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.