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Finding the Fourth Proportional to 172,745.17, 258,921.20 and 105,128.04

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Solution

The fourth proportional to 172,745.17, 258,921.20 and 105,128.04 is: 157,572.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,745.17 : 258,921.20 = 105,128.04 : x
  2. Step 2: Convert to fraction form
    172,745.17/258,921.20 = 105,128.04/x
  3. Step 3: Cross multiply
    172,745.17x = 258,921.20 × 105,128.04
  4. Step 4: Simplify right side
    172,745.17x = 27,219,876,450.20
  5. Step 5: Solve for x
    x = 27,219,876,450.20/172,745.17
  6. Step 6: Final answer
    x = 157,572.43

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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.