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Finding the Fourth Proportional to 520,120.20, 780,180.30 and 253,921.80

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Solution

The fourth proportional to 520,120.20, 780,180.30 and 253,921.80 is: 380,882.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,120.20 : 780,180.30 = 253,921.80 : x
  2. Step 2: Convert to fraction form
    520,120.20/780,180.30 = 253,921.80/x
  3. Step 3: Cross multiply
    520,120.20x = 780,180.30 × 253,921.80
  4. Step 4: Simplify right side
    520,120.20x = 198,104,786,100.54
  5. Step 5: Solve for x
    x = 198,104,786,100.54/520,120.20
  6. Step 6: Final answer
    x = 380,882.70

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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.