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Finding the Fourth Proportional to 20,739, 28,619.82 and 13,287.48

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Solution

The fourth proportional to 20,739, 28,619.82 and 13,287.48 is: 18,336.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739 : 28,619.82 = 13,287.48 : x
  2. Step 2: Convert to fraction form
    20,739/28,619.82 = 13,287.48/x
  3. Step 3: Cross multiply
    20,739x = 28,619.82 × 13,287.48
  4. Step 4: Simplify right side
    20,739x = 380,285,285.85
  5. Step 5: Solve for x
    x = 380,285,285.85/20,739
  6. Step 6: Final answer
    x = 18,336.72

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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.