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Finding the Fourth Proportional to 15,687.72, 21,649.86 and 8,614.44

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Solution

The fourth proportional to 15,687.72, 21,649.86 and 8,614.44 is: 11,888.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.72 : 21,649.86 = 8,614.44 : x
  2. Step 2: Convert to fraction form
    15,687.72/21,649.86 = 8,614.44/x
  3. Step 3: Cross multiply
    15,687.72x = 21,649.86 × 8,614.44
  4. Step 4: Simplify right side
    15,687.72x = 186,501,419.98
  5. Step 5: Solve for x
    x = 186,501,419.98/15,687.72
  6. Step 6: Final answer
    x = 11,888.37

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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.