Home / 20,385.23-28,133.96-13,578.89

Finding the Fourth Proportional to 20,385.23, 28,133.96 and 13,578.89

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Solution

The fourth proportional to 20,385.23, 28,133.96 and 13,578.89 is: 18,740.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.23 : 28,133.96 = 13,578.89 : x
  2. Step 2: Convert to fraction form
    20,385.23/28,133.96 = 13,578.89/x
  3. Step 3: Cross multiply
    20,385.23x = 28,133.96 × 13,578.89
  4. Step 4: Simplify right side
    20,385.23x = 382,027,739.54
  5. Step 5: Solve for x
    x = 382,027,739.54/20,385.23
  6. Step 6: Final answer
    x = 18,740.42

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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.