Home / 20,388.84-28,136.70-11,435.82

Finding the Fourth Proportional to 20,388.84, 28,136.70 and 11,435.82

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Solution

The fourth proportional to 20,388.84, 28,136.70 and 11,435.82 is: 15,781.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.84 : 28,136.70 = 11,435.82 : x
  2. Step 2: Convert to fraction form
    20,388.84/28,136.70 = 11,435.82/x
  3. Step 3: Cross multiply
    20,388.84x = 28,136.70 × 11,435.82
  4. Step 4: Simplify right side
    20,388.84x = 321,766,236.59
  5. Step 5: Solve for x
    x = 321,766,236.59/20,388.84
  6. Step 6: Final answer
    x = 15,781.49

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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.