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Finding the Fourth Proportional to 17,109.20, 25,615.20 and 13,188.80

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Solution

The fourth proportional to 17,109.20, 25,615.20 and 13,188.80 is: 19,745.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,109.20 : 25,615.20 = 13,188.80 : x
  2. Step 2: Convert to fraction form
    17,109.20/25,615.20 = 13,188.80/x
  3. Step 3: Cross multiply
    17,109.20x = 25,615.20 × 13,188.80
  4. Step 4: Simplify right side
    17,109.20x = 337,833,749.76
  5. Step 5: Solve for x
    x = 337,833,749.76/17,109.20
  6. Step 6: Final answer
    x = 19,745.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.