Home / 21,008.72-28,991.90-11,577.29

Finding the Fourth Proportional to 21,008.72, 28,991.90 and 11,577.29

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Solution

The fourth proportional to 21,008.72, 28,991.90 and 11,577.29 is: 15,976.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.72 : 28,991.90 = 11,577.29 : x
  2. Step 2: Convert to fraction form
    21,008.72/28,991.90 = 11,577.29/x
  3. Step 3: Cross multiply
    21,008.72x = 28,991.90 × 11,577.29
  4. Step 4: Simplify right side
    21,008.72x = 335,647,431.11
  5. Step 5: Solve for x
    x = 335,647,431.11/21,008.72
  6. Step 6: Final answer
    x = 15,976.58

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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.