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Finding the Fourth Proportional to 15,620.18, 21,556.22 and 8,906.45

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Solution

The fourth proportional to 15,620.18, 21,556.22 and 8,906.45 is: 12,291.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,620.18 : 21,556.22 = 8,906.45 : x
  2. Step 2: Convert to fraction form
    15,620.18/21,556.22 = 8,906.45/x
  3. Step 3: Cross multiply
    15,620.18x = 21,556.22 × 8,906.45
  4. Step 4: Simplify right side
    15,620.18x = 191,989,243.31
  5. Step 5: Solve for x
    x = 191,989,243.31/15,620.18
  6. Step 6: Final answer
    x = 12,291.11

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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.