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Finding the Fourth Proportional to 18,721, 28,081.36 and 7,625.08

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Solution

The fourth proportional to 18,721, 28,081.36 and 7,625.08 is: 11,437.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721 : 28,081.36 = 7,625.08 : x
  2. Step 2: Convert to fraction form
    18,721/28,081.36 = 7,625.08/x
  3. Step 3: Cross multiply
    18,721x = 28,081.36 × 7,625.08
  4. Step 4: Simplify right side
    18,721x = 214,122,616.51
  5. Step 5: Solve for x
    x = 214,122,616.51/18,721
  6. Step 6: Final answer
    x = 11,437.56

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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.