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Finding the Fourth Proportional to 20,910.98, 28,844.97 and 13,458.98

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Solution

The fourth proportional to 20,910.98, 28,844.97 and 13,458.98 is: 18,565.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.98 : 28,844.97 = 13,458.98 : x
  2. Step 2: Convert to fraction form
    20,910.98/28,844.97 = 13,458.98/x
  3. Step 3: Cross multiply
    20,910.98x = 28,844.97 × 13,458.98
  4. Step 4: Simplify right side
    20,910.98x = 388,223,874.33
  5. Step 5: Solve for x
    x = 388,223,874.33/20,910.98
  6. Step 6: Final answer
    x = 18,565.55

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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.