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Finding the Fourth Proportional to 21,916.78, 32,879.49 and 7,124.74

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Solution

The fourth proportional to 21,916.78, 32,879.49 and 7,124.74 is: 10,688.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,916.78 : 32,879.49 = 7,124.74 : x
  2. Step 2: Convert to fraction form
    21,916.78/32,879.49 = 7,124.74/x
  3. Step 3: Cross multiply
    21,916.78x = 32,879.49 × 7,124.74
  4. Step 4: Simplify right side
    21,916.78x = 234,257,817.58
  5. Step 5: Solve for x
    x = 234,257,817.58/21,916.78
  6. Step 6: Final answer
    x = 10,688.51

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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.