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Finding the Fourth Proportional to 15,221.31, 21,004.98 and 8,506.96

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Solution

The fourth proportional to 15,221.31, 21,004.98 and 8,506.96 is: 11,739.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,221.31 : 21,004.98 = 8,506.96 : x
  2. Step 2: Convert to fraction form
    15,221.31/21,004.98 = 8,506.96/x
  3. Step 3: Cross multiply
    15,221.31x = 21,004.98 × 8,506.96
  4. Step 4: Simplify right side
    15,221.31x = 178,688,524.66
  5. Step 5: Solve for x
    x = 178,688,524.66/15,221.31
  6. Step 6: Final answer
    x = 11,739.37

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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.