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Finding the Fourth Proportional to 15,138.63, 20,891.63 and 8,425.45

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Solution

The fourth proportional to 15,138.63, 20,891.63 and 8,425.45 is: 11,627.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.63 : 20,891.63 = 8,425.45 : x
  2. Step 2: Convert to fraction form
    15,138.63/20,891.63 = 8,425.45/x
  3. Step 3: Cross multiply
    15,138.63x = 20,891.63 × 8,425.45
  4. Step 4: Simplify right side
    15,138.63x = 176,021,383.98
  5. Step 5: Solve for x
    x = 176,021,383.98/15,138.63
  6. Step 6: Final answer
    x = 11,627.30

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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.