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Finding the Fourth Proportional to 61,309.74, 91,971.81 and 21,872.46

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Solution

The fourth proportional to 61,309.74, 91,971.81 and 21,872.46 is: 32,811.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,309.74 : 91,971.81 = 21,872.46 : x
  2. Step 2: Convert to fraction form
    61,309.74/91,971.81 = 21,872.46/x
  3. Step 3: Cross multiply
    61,309.74x = 91,971.81 × 21,872.46
  4. Step 4: Simplify right side
    61,309.74x = 2,011,649,735.35
  5. Step 5: Solve for x
    x = 2,011,649,735.35/61,309.74
  6. Step 6: Final answer
    x = 32,811.26

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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.