Home / 20,949.64-28,910-11,389.26

Finding the Fourth Proportional to 20,949.64, 28,910 and 11,389.26

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Solution

The fourth proportional to 20,949.64, 28,910 and 11,389.26 is: 15,716.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,949.64 : 28,910 = 11,389.26 : x
  2. Step 2: Convert to fraction form
    20,949.64/28,910 = 11,389.26/x
  3. Step 3: Cross multiply
    20,949.64x = 28,910 × 11,389.26
  4. Step 4: Simplify right side
    20,949.64x = 329,263,506.60
  5. Step 5: Solve for x
    x = 329,263,506.60/20,949.64
  6. Step 6: Final answer
    x = 15,716.91

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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.