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Finding the Fourth Proportional to 15,218.70, 20,999.47 and 8,504.61

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Solution

The fourth proportional to 15,218.70, 20,999.47 and 8,504.61 is: 11,735.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,218.70 : 20,999.47 = 8,504.61 : x
  2. Step 2: Convert to fraction form
    15,218.70/20,999.47 = 8,504.61/x
  3. Step 3: Cross multiply
    15,218.70x = 20,999.47 × 8,504.61
  4. Step 4: Simplify right side
    15,218.70x = 178,592,302.56
  5. Step 5: Solve for x
    x = 178,592,302.56/15,218.70
  6. Step 6: Final answer
    x = 11,735.06

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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.