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Finding the Fourth Proportional to 15,129.89, 20,876.16 and 8,841.05

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Solution

The fourth proportional to 15,129.89, 20,876.16 and 8,841.05 is: 12,198.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129.89 : 20,876.16 = 8,841.05 : x
  2. Step 2: Convert to fraction form
    15,129.89/20,876.16 = 8,841.05/x
  3. Step 3: Cross multiply
    15,129.89x = 20,876.16 × 8,841.05
  4. Step 4: Simplify right side
    15,129.89x = 184,567,174.37
  5. Step 5: Solve for x
    x = 184,567,174.37/15,129.89
  6. Step 6: Final answer
    x = 12,198.84

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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.