Home / 20,859.85-28,786.65-11,428.42

Finding the Fourth Proportional to 20,859.85, 28,786.65 and 11,428.42

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Solution

The fourth proportional to 20,859.85, 28,786.65 and 11,428.42 is: 15,771.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.85 : 28,786.65 = 11,428.42 : x
  2. Step 2: Convert to fraction form
    20,859.85/28,786.65 = 11,428.42/x
  3. Step 3: Cross multiply
    20,859.85x = 28,786.65 × 11,428.42
  4. Step 4: Simplify right side
    20,859.85x = 328,985,926.59
  5. Step 5: Solve for x
    x = 328,985,926.59/20,859.85
  6. Step 6: Final answer
    x = 15,771.25

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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.