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Finding the Fourth Proportional to 13,929.64, 20,889.20 and 5,606.82

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Solution

The fourth proportional to 13,929.64, 20,889.20 and 5,606.82 is: 8,408.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,929.64 : 20,889.20 = 5,606.82 : x
  2. Step 2: Convert to fraction form
    13,929.64/20,889.20 = 5,606.82/x
  3. Step 3: Cross multiply
    13,929.64x = 20,889.20 × 5,606.82
  4. Step 4: Simplify right side
    13,929.64x = 117,121,984.34
  5. Step 5: Solve for x
    x = 117,121,984.34/13,929.64
  6. Step 6: Final answer
    x = 8,408.11

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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.