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Finding the Fourth Proportional to 15,815.88, 21,825.54 and 8,645.49

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Solution

The fourth proportional to 15,815.88, 21,825.54 and 8,645.49 is: 11,930.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,815.88 : 21,825.54 = 8,645.49 : x
  2. Step 2: Convert to fraction form
    15,815.88/21,825.54 = 8,645.49/x
  3. Step 3: Cross multiply
    15,815.88x = 21,825.54 × 8,645.49
  4. Step 4: Simplify right side
    15,815.88x = 188,692,487.81
  5. Step 5: Solve for x
    x = 188,692,487.81/15,815.88
  6. Step 6: Final answer
    x = 11,930.57

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1.5x scale

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.