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Finding the Fourth Proportional to 172,108.90, 258,264.48 and 72,261.42

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Solution

The fourth proportional to 172,108.90, 258,264.48 and 72,261.42 is: 108,434.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,108.90 : 258,264.48 = 72,261.42 : x
  2. Step 2: Convert to fraction form
    172,108.90/258,264.48 = 72,261.42/x
  3. Step 3: Cross multiply
    172,108.90x = 258,264.48 × 72,261.42
  4. Step 4: Simplify right side
    172,108.90x = 18,662,557,362.85
  5. Step 5: Solve for x
    x = 18,662,557,362.85/172,108.90
  6. Step 6: Final answer
    x = 108,434.59

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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.