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Finding the Fourth Proportional to 86,611, 129,916.62 and 20,947

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Solution

The fourth proportional to 86,611, 129,916.62 and 20,947 is: 31,420.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,611 : 129,916.62 = 20,947 : x
  2. Step 2: Convert to fraction form
    86,611/129,916.62 = 20,947/x
  3. Step 3: Cross multiply
    86,611x = 129,916.62 × 20,947
  4. Step 4: Simplify right side
    86,611x = 2,721,363,439.14
  5. Step 5: Solve for x
    x = 2,721,363,439.14/86,611
  6. Step 6: Final answer
    x = 31,420.53

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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.