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Finding the Fourth Proportional to 124,906.39, 172,427.11 and 79,645.21

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Solution

The fourth proportional to 124,906.39, 172,427.11 and 79,645.21 is: 109,946.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,906.39 : 172,427.11 = 79,645.21 : x
  2. Step 2: Convert to fraction form
    124,906.39/172,427.11 = 79,645.21/x
  3. Step 3: Cross multiply
    124,906.39x = 172,427.11 × 79,645.21
  4. Step 4: Simplify right side
    124,906.39x = 13,732,992,755.46
  5. Step 5: Solve for x
    x = 13,732,992,755.46/124,906.39
  6. Step 6: Final answer
    x = 109,946.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.