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Finding the Fourth Proportional to 18,691.78, 25,796.72 and 11,520.25

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Solution

The fourth proportional to 18,691.78, 25,796.72 and 11,520.25 is: 15,899.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.78 : 25,796.72 = 11,520.25 : x
  2. Step 2: Convert to fraction form
    18,691.78/25,796.72 = 11,520.25/x
  3. Step 3: Cross multiply
    18,691.78x = 25,796.72 × 11,520.25
  4. Step 4: Simplify right side
    18,691.78x = 297,184,663.58
  5. Step 5: Solve for x
    x = 297,184,663.58/18,691.78
  6. Step 6: Final answer
    x = 15,899.22

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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.