Home / 21,008.96-28,991.20-11,576.80

Finding the Fourth Proportional to 21,008.96, 28,991.20 and 11,576.80

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Solution

The fourth proportional to 21,008.96, 28,991.20 and 11,576.80 is: 15,975.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.96 : 28,991.20 = 11,576.80 : x
  2. Step 2: Convert to fraction form
    21,008.96/28,991.20 = 11,576.80/x
  3. Step 3: Cross multiply
    21,008.96x = 28,991.20 × 11,576.80
  4. Step 4: Simplify right side
    21,008.96x = 335,625,324.16
  5. Step 5: Solve for x
    x = 335,625,324.16/21,008.96
  6. Step 6: Final answer
    x = 15,975.34

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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.