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Finding the Fourth Proportional to 20,755, 28,621.92 and 13,964.32

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Solution

The fourth proportional to 20,755, 28,621.92 and 13,964.32 is: 19,257.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,755 : 28,621.92 = 13,964.32 : x
  2. Step 2: Convert to fraction form
    20,755/28,621.92 = 13,964.32/x
  3. Step 3: Cross multiply
    20,755x = 28,621.92 × 13,964.32
  4. Step 4: Simplify right side
    20,755x = 399,685,649.89
  5. Step 5: Solve for x
    x = 399,685,649.89/20,755
  6. Step 6: Final answer
    x = 19,257.32

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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.