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Finding the Fourth Proportional to 81,126, 121,689 and 25,722

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Solution

The fourth proportional to 81,126, 121,689 and 25,722 is: 38,583

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,126 : 121,689 = 25,722 : x
  2. Step 2: Convert to fraction form
    81,126/121,689 = 25,722/x
  3. Step 3: Cross multiply
    81,126x = 121,689 × 25,722
  4. Step 4: Simplify right side
    81,126x = 3,130,084,458
  5. Step 5: Solve for x
    x = 3,130,084,458/81,126
  6. Step 6: Final answer
    x = 38,583

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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.