Home / 20,109.36-30,144.60-7,620.78

Finding the Fourth Proportional to 20,109.36, 30,144.60 and 7,620.78

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Solution

The fourth proportional to 20,109.36, 30,144.60 and 7,620.78 is: 11,423.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,109.36 : 30,144.60 = 7,620.78 : x
  2. Step 2: Convert to fraction form
    20,109.36/30,144.60 = 7,620.78/x
  3. Step 3: Cross multiply
    20,109.36x = 30,144.60 × 7,620.78
  4. Step 4: Simplify right side
    20,109.36x = 229,725,364.79
  5. Step 5: Solve for x
    x = 229,725,364.79/20,109.36
  6. Step 6: Final answer
    x = 11,423.80

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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.