Home / 20,369.99-28,120.42-13,575.32

Finding the Fourth Proportional to 20,369.99, 28,120.42 and 13,575.32

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Solution

The fourth proportional to 20,369.99, 28,120.42 and 13,575.32 is: 18,740.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,369.99 : 28,120.42 = 13,575.32 : x
  2. Step 2: Convert to fraction form
    20,369.99/28,120.42 = 13,575.32/x
  3. Step 3: Cross multiply
    20,369.99x = 28,120.42 × 13,575.32
  4. Step 4: Simplify right side
    20,369.99x = 381,743,605.49
  5. Step 5: Solve for x
    x = 381,743,605.49/20,369.99
  6. Step 6: Final answer
    x = 18,740.49

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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.