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Finding the Fourth Proportional to 18,609.90, 25,659.09 and 13,885.98

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Solution

The fourth proportional to 18,609.90, 25,659.09 and 13,885.98 is: 19,145.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,609.90 : 25,659.09 = 13,885.98 : x
  2. Step 2: Convert to fraction form
    18,609.90/25,659.09 = 13,885.98/x
  3. Step 3: Cross multiply
    18,609.90x = 25,659.09 × 13,885.98
  4. Step 4: Simplify right side
    18,609.90x = 356,301,610.56
  5. Step 5: Solve for x
    x = 356,301,610.56/18,609.90
  6. Step 6: Final answer
    x = 19,145.81

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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.