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Finding the Fourth Proportional to 20,765.88, 28,641.06 and 13,213.44

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Solution

The fourth proportional to 20,765.88, 28,641.06 and 13,213.44 is: 18,224.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,765.88 : 28,641.06 = 13,213.44 : x
  2. Step 2: Convert to fraction form
    20,765.88/28,641.06 = 13,213.44/x
  3. Step 3: Cross multiply
    20,765.88x = 28,641.06 × 13,213.44
  4. Step 4: Simplify right side
    20,765.88x = 378,446,927.85
  5. Step 5: Solve for x
    x = 378,446,927.85/20,765.88
  6. Step 6: Final answer
    x = 18,224.46

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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.