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Finding the Fourth Proportional to 81,611.71, 122,403.45 and 21,640.57

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Solution

The fourth proportional to 81,611.71, 122,403.45 and 21,640.57 is: 32,457.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,611.71 : 122,403.45 = 21,640.57 : x
  2. Step 2: Convert to fraction form
    81,611.71/122,403.45 = 21,640.57/x
  3. Step 3: Cross multiply
    81,611.71x = 122,403.45 × 21,640.57
  4. Step 4: Simplify right side
    81,611.71x = 2,648,880,427.97
  5. Step 5: Solve for x
    x = 2,648,880,427.97/81,611.71
  6. Step 6: Final answer
    x = 32,457.11

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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.