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Finding the Fourth Proportional to 520,080.20, 780,120.30 and 268,137.80

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Solution

The fourth proportional to 520,080.20, 780,120.30 and 268,137.80 is: 402,206.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,080.20 : 780,120.30 = 268,137.80 : x
  2. Step 2: Convert to fraction form
    520,080.20/780,120.30 = 268,137.80/x
  3. Step 3: Cross multiply
    520,080.20x = 780,120.30 × 268,137.80
  4. Step 4: Simplify right side
    520,080.20x = 209,179,740,977.34
  5. Step 5: Solve for x
    x = 209,179,740,977.34/520,080.20
  6. Step 6: Final answer
    x = 402,206.70

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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.