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Finding the Fourth Proportional to 18,726, 25,782.91 and 15,887.49

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Solution

The fourth proportional to 18,726, 25,782.91 and 15,887.49 is: 21,874.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,726 : 25,782.91 = 15,887.49 : x
  2. Step 2: Convert to fraction form
    18,726/25,782.91 = 15,887.49/x
  3. Step 3: Cross multiply
    18,726x = 25,782.91 × 15,887.49
  4. Step 4: Simplify right side
    18,726x = 409,625,724.80
  5. Step 5: Solve for x
    x = 409,625,724.80/18,726
  6. Step 6: Final answer
    x = 21,874.70

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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.