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Finding the Fourth Proportional to 19,728, 27,225.72 and 11,345.04

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Solution

The fourth proportional to 19,728, 27,225.72 and 11,345.04 is: 15,656.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,728 : 27,225.72 = 11,345.04 : x
  2. Step 2: Convert to fraction form
    19,728/27,225.72 = 11,345.04/x
  3. Step 3: Cross multiply
    19,728x = 27,225.72 × 11,345.04
  4. Step 4: Simplify right side
    19,728x = 308,876,882.43
  5. Step 5: Solve for x
    x = 308,876,882.43/19,728
  6. Step 6: Final answer
    x = 15,656.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.