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Finding the Fourth Proportional to 19,138.88, 28,713.90 and 11,748.08

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Solution

The fourth proportional to 19,138.88, 28,713.90 and 11,748.08 is: 17,625.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,138.88 : 28,713.90 = 11,748.08 : x
  2. Step 2: Convert to fraction form
    19,138.88/28,713.90 = 11,748.08/x
  3. Step 3: Cross multiply
    19,138.88x = 28,713.90 × 11,748.08
  4. Step 4: Simplify right side
    19,138.88x = 337,333,194.31
  5. Step 5: Solve for x
    x = 337,333,194.31/19,138.88
  6. Step 6: Final answer
    x = 17,625.55

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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.