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Finding the Fourth Proportional to 80,705.88, 121,058.42 and 20,734.29

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Solution

The fourth proportional to 80,705.88, 121,058.42 and 20,734.29 is: 31,101.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,705.88 : 121,058.42 = 20,734.29 : x
  2. Step 2: Convert to fraction form
    80,705.88/121,058.42 = 20,734.29/x
  3. Step 3: Cross multiply
    80,705.88x = 121,058.42 × 20,734.29
  4. Step 4: Simplify right side
    80,705.88x = 2,510,060,283.55
  5. Step 5: Solve for x
    x = 2,510,060,283.55/80,705.88
  6. Step 6: Final answer
    x = 31,101.33

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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.