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Finding the Fourth Proportional to 19,625.28, 27,072 and 12,912

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Solution

The fourth proportional to 19,625.28, 27,072 and 12,912 is: 17,811.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,625.28 : 27,072 = 12,912 : x
  2. Step 2: Convert to fraction form
    19,625.28/27,072 = 12,912/x
  3. Step 3: Cross multiply
    19,625.28x = 27,072 × 12,912
  4. Step 4: Simplify right side
    19,625.28x = 349,553,664
  5. Step 5: Solve for x
    x = 349,553,664/19,625.28
  6. Step 6: Final answer
    x = 17,811.40

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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.