Home / 20,102.78-30,159.23-11,789.75

Finding the Fourth Proportional to 20,102.78, 30,159.23 and 11,789.75

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Solution

The fourth proportional to 20,102.78, 30,159.23 and 11,789.75 is: 17,687.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,102.78 : 30,159.23 = 11,789.75 : x
  2. Step 2: Convert to fraction form
    20,102.78/30,159.23 = 11,789.75/x
  3. Step 3: Cross multiply
    20,102.78x = 30,159.23 × 11,789.75
  4. Step 4: Simplify right side
    20,102.78x = 355,569,781.89
  5. Step 5: Solve for x
    x = 355,569,781.89/20,102.78
  6. Step 6: Final answer
    x = 17,687.59

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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.