Home / 20,421.87-28,175.16-12,759.94

Finding the Fourth Proportional to 20,421.87, 28,175.16 and 12,759.94

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Solution

The fourth proportional to 20,421.87, 28,175.16 and 12,759.94 is: 17,604.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.87 : 28,175.16 = 12,759.94 : x
  2. Step 2: Convert to fraction form
    20,421.87/28,175.16 = 12,759.94/x
  3. Step 3: Cross multiply
    20,421.87x = 28,175.16 × 12,759.94
  4. Step 4: Simplify right side
    20,421.87x = 359,513,351.09
  5. Step 5: Solve for x
    x = 359,513,351.09/20,421.87
  6. Step 6: Final answer
    x = 17,604.33

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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.