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Finding the Fourth Proportional to 18,643.88, 25,720.04 and 11,085.90

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Solution

The fourth proportional to 18,643.88, 25,720.04 and 11,085.90 is: 15,293.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,643.88 : 25,720.04 = 11,085.90 : x
  2. Step 2: Convert to fraction form
    18,643.88/25,720.04 = 11,085.90/x
  3. Step 3: Cross multiply
    18,643.88x = 25,720.04 × 11,085.90
  4. Step 4: Simplify right side
    18,643.88x = 285,129,736.01
  5. Step 5: Solve for x
    x = 285,129,736.01/18,643.88
  6. Step 6: Final answer
    x = 15,293.48

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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.