Home / 20,820.57-31,180.81-11,908.89

Finding the Fourth Proportional to 20,820.57, 31,180.81 and 11,908.89

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Solution

The fourth proportional to 20,820.57, 31,180.81 and 11,908.89 is: 17,834.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.57 : 31,180.81 = 11,908.89 : x
  2. Step 2: Convert to fraction form
    20,820.57/31,180.81 = 11,908.89/x
  3. Step 3: Cross multiply
    20,820.57x = 31,180.81 × 11,908.89
  4. Step 4: Simplify right side
    20,820.57x = 371,328,806.63
  5. Step 5: Solve for x
    x = 371,328,806.63/20,820.57
  6. Step 6: Final answer
    x = 17,834.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.