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Finding the Fourth Proportional to 13,615.90, 18,792.87 and 8,309.58

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Solution

The fourth proportional to 13,615.90, 18,792.87 and 8,309.58 is: 11,469.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.90 : 18,792.87 = 8,309.58 : x
  2. Step 2: Convert to fraction form
    13,615.90/18,792.87 = 8,309.58/x
  3. Step 3: Cross multiply
    13,615.90x = 18,792.87 × 8,309.58
  4. Step 4: Simplify right side
    13,615.90x = 156,160,856.69
  5. Step 5: Solve for x
    x = 156,160,856.69/13,615.90
  6. Step 6: Final answer
    x = 11,469.01

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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.