Home / 20,121.56-30,178.35-10,123.64

Finding the Fourth Proportional to 20,121.56, 30,178.35 and 10,123.64

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Solution

The fourth proportional to 20,121.56, 30,178.35 and 10,123.64 is: 15,183.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.56 : 30,178.35 = 10,123.64 : x
  2. Step 2: Convert to fraction form
    20,121.56/30,178.35 = 10,123.64/x
  3. Step 3: Cross multiply
    20,121.56x = 30,178.35 × 10,123.64
  4. Step 4: Simplify right side
    20,121.56x = 305,514,751.19
  5. Step 5: Solve for x
    x = 305,514,751.19/20,121.56
  6. Step 6: Final answer
    x = 15,183.45

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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.