Home / 20,604.32-28,433.64-11,172.80

Finding the Fourth Proportional to 20,604.32, 28,433.64 and 11,172.80

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Solution

The fourth proportional to 20,604.32, 28,433.64 and 11,172.80 is: 15,418.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,604.32 : 28,433.64 = 11,172.80 : x
  2. Step 2: Convert to fraction form
    20,604.32/28,433.64 = 11,172.80/x
  3. Step 3: Cross multiply
    20,604.32x = 28,433.64 × 11,172.80
  4. Step 4: Simplify right side
    20,604.32x = 317,683,372.99
  5. Step 5: Solve for x
    x = 317,683,372.99/20,604.32
  6. Step 6: Final answer
    x = 15,418.29

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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.