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Finding the Fourth Proportional to 21,940.35, 32,913.26 and 7,145.29

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Solution

The fourth proportional to 21,940.35, 32,913.26 and 7,145.29 is: 10,718.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,940.35 : 32,913.26 = 7,145.29 : x
  2. Step 2: Convert to fraction form
    21,940.35/32,913.26 = 7,145.29/x
  3. Step 3: Cross multiply
    21,940.35x = 32,913.26 × 7,145.29
  4. Step 4: Simplify right side
    21,940.35x = 235,174,787.55
  5. Step 5: Solve for x
    x = 235,174,787.55/21,940.35
  6. Step 6: Final answer
    x = 10,718.83

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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.