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Finding the Fourth Proportional to 15,216.78, 20,999.20 and 8,502.66

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Solution

The fourth proportional to 15,216.78, 20,999.20 and 8,502.66 is: 11,733.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,216.78 : 20,999.20 = 8,502.66 : x
  2. Step 2: Convert to fraction form
    15,216.78/20,999.20 = 8,502.66/x
  3. Step 3: Cross multiply
    15,216.78x = 20,999.20 × 8,502.66
  4. Step 4: Simplify right side
    15,216.78x = 178,549,057.87
  5. Step 5: Solve for x
    x = 178,549,057.87/15,216.78
  6. Step 6: Final answer
    x = 11,733.70

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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.