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Finding the Fourth Proportional to 13,978.71, 20,930.81 and 11,764.44

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Solution

The fourth proportional to 13,978.71, 20,930.81 and 11,764.44 is: 17,615.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,978.71 : 20,930.81 = 11,764.44 : x
  2. Step 2: Convert to fraction form
    13,978.71/20,930.81 = 11,764.44/x
  3. Step 3: Cross multiply
    13,978.71x = 20,930.81 × 11,764.44
  4. Step 4: Simplify right side
    13,978.71x = 246,239,199.57
  5. Step 5: Solve for x
    x = 246,239,199.57/13,978.71
  6. Step 6: Final answer
    x = 17,615.30

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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.