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Finding the Fourth Proportional to 13,913.20, 19,201.25 and 8,611.10

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Solution

The fourth proportional to 13,913.20, 19,201.25 and 8,611.10 is: 11,883.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,913.20 : 19,201.25 = 8,611.10 : x
  2. Step 2: Convert to fraction form
    13,913.20/19,201.25 = 8,611.10/x
  3. Step 3: Cross multiply
    13,913.20x = 19,201.25 × 8,611.10
  4. Step 4: Simplify right side
    13,913.20x = 165,343,883.88
  5. Step 5: Solve for x
    x = 165,343,883.88/13,913.20
  6. Step 6: Final answer
    x = 11,883.96

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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.