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Finding the Fourth Proportional to 18,649.56, 25,728.30 and 10,689.96

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Solution

The fourth proportional to 18,649.56, 25,728.30 and 10,689.96 is: 14,747.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,649.56 : 25,728.30 = 10,689.96 : x
  2. Step 2: Convert to fraction form
    18,649.56/25,728.30 = 10,689.96/x
  3. Step 3: Cross multiply
    18,649.56x = 25,728.30 × 10,689.96
  4. Step 4: Simplify right side
    18,649.56x = 275,034,497.87
  5. Step 5: Solve for x
    x = 275,034,497.87/18,649.56
  6. Step 6: Final answer
    x = 14,747.51

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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.