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Finding the Fourth Proportional to 15,191.96, 20,961.54 and 8,814.86

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Solution

The fourth proportional to 15,191.96, 20,961.54 and 8,814.86 is: 12,162.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,191.96 : 20,961.54 = 8,814.86 : x
  2. Step 2: Convert to fraction form
    15,191.96/20,961.54 = 8,814.86/x
  3. Step 3: Cross multiply
    15,191.96x = 20,961.54 × 8,814.86
  4. Step 4: Simplify right side
    15,191.96x = 184,773,014.28
  5. Step 5: Solve for x
    x = 184,773,014.28/15,191.96
  6. Step 6: Final answer
    x = 12,162.56

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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.