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Finding the Fourth Proportional to 15,138.72, 20,890.08 and 8,514.72

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Solution

The fourth proportional to 15,138.72, 20,890.08 and 8,514.72 is: 11,749.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.72 : 20,890.08 = 8,514.72 : x
  2. Step 2: Convert to fraction form
    15,138.72/20,890.08 = 8,514.72/x
  3. Step 3: Cross multiply
    15,138.72x = 20,890.08 × 8,514.72
  4. Step 4: Simplify right side
    15,138.72x = 177,873,181.98
  5. Step 5: Solve for x
    x = 177,873,181.98/15,138.72
  6. Step 6: Final answer
    x = 11,749.55

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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.