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Finding the Fourth Proportional to 20,908.98, 28,842.21 and 13,456.98

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Solution

The fourth proportional to 20,908.98, 28,842.21 and 13,456.98 is: 18,562.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.98 : 28,842.21 = 13,456.98 : x
  2. Step 2: Convert to fraction form
    20,908.98/28,842.21 = 13,456.98/x
  3. Step 3: Cross multiply
    20,908.98x = 28,842.21 × 13,456.98
  4. Step 4: Simplify right side
    20,908.98x = 388,129,043.13
  5. Step 5: Solve for x
    x = 388,129,043.13/20,908.98
  6. Step 6: Final answer
    x = 18,562.79

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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.