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Finding the Fourth Proportional to 15,106.89, 20,845.12 and 8,731.11

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Solution

The fourth proportional to 15,106.89, 20,845.12 and 8,731.11 is: 12,047.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,106.89 : 20,845.12 = 8,731.11 : x
  2. Step 2: Convert to fraction form
    15,106.89/20,845.12 = 8,731.11/x
  3. Step 3: Cross multiply
    15,106.89x = 20,845.12 × 8,731.11
  4. Step 4: Simplify right side
    15,106.89x = 182,001,035.68
  5. Step 5: Solve for x
    x = 182,001,035.68/15,106.89
  6. Step 6: Final answer
    x = 12,047.55

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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.