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Finding the Fourth Proportional to 19,940.65, 29,921.91 and 7,469.28

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Solution

The fourth proportional to 19,940.65, 29,921.91 and 7,469.28 is: 11,208.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,940.65 : 29,921.91 = 7,469.28 : x
  2. Step 2: Convert to fraction form
    19,940.65/29,921.91 = 7,469.28/x
  3. Step 3: Cross multiply
    19,940.65x = 29,921.91 × 7,469.28
  4. Step 4: Simplify right side
    19,940.65x = 223,495,095.92
  5. Step 5: Solve for x
    x = 223,495,095.92/19,940.65
  6. Step 6: Final answer
    x = 11,208.02

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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.