Home / 20,839.63-28,758.71-11,408.21

Finding the Fourth Proportional to 20,839.63, 28,758.71 and 11,408.21

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Solution

The fourth proportional to 20,839.63, 28,758.71 and 11,408.21 is: 15,743.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,839.63 : 28,758.71 = 11,408.21 : x
  2. Step 2: Convert to fraction form
    20,839.63/28,758.71 = 11,408.21/x
  3. Step 3: Cross multiply
    20,839.63x = 28,758.71 × 11,408.21
  4. Step 4: Simplify right side
    20,839.63x = 328,085,345.97
  5. Step 5: Solve for x
    x = 328,085,345.97/20,839.63
  6. Step 6: Final answer
    x = 15,743.34

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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.