Home / 20,415.28-28,175.34-11,919.49

Finding the Fourth Proportional to 20,415.28, 28,175.34 and 11,919.49

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Solution

The fourth proportional to 20,415.28, 28,175.34 and 11,919.49 is: 16,450.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,415.28 : 28,175.34 = 11,919.49 : x
  2. Step 2: Convert to fraction form
    20,415.28/28,175.34 = 11,919.49/x
  3. Step 3: Cross multiply
    20,415.28x = 28,175.34 × 11,919.49
  4. Step 4: Simplify right side
    20,415.28x = 335,835,612.94
  5. Step 5: Solve for x
    x = 335,835,612.94/20,415.28
  6. Step 6: Final answer
    x = 16,450.21

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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.