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Finding the Fourth Proportional to 520,072.20, 780,108.30 and 436,091.40

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Solution

The fourth proportional to 520,072.20, 780,108.30 and 436,091.40 is: 654,137.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,072.20 : 780,108.30 = 436,091.40 : x
  2. Step 2: Convert to fraction form
    520,072.20/780,108.30 = 436,091.40/x
  3. Step 3: Cross multiply
    520,072.20x = 780,108.30 × 436,091.40
  4. Step 4: Simplify right side
    520,072.20x = 340,198,520,698.62
  5. Step 5: Solve for x
    x = 340,198,520,698.62/520,072.20
  6. Step 6: Final answer
    x = 654,137.10

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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.