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Finding the Fourth Proportional to 18,388.91, 25,381.91 and 10,839.62

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Solution

The fourth proportional to 18,388.91, 25,381.91 and 10,839.62 is: 14,961.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,388.91 : 25,381.91 = 10,839.62 : x
  2. Step 2: Convert to fraction form
    18,388.91/25,381.91 = 10,839.62/x
  3. Step 3: Cross multiply
    18,388.91x = 25,381.91 × 10,839.62
  4. Step 4: Simplify right side
    18,388.91x = 275,130,205.08
  5. Step 5: Solve for x
    x = 275,130,205.08/18,388.91
  6. Step 6: Final answer
    x = 14,961.75

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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.