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Finding the Fourth Proportional to 1,313,621.20, 1,970,431.80 and 864,848.80

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Solution

The fourth proportional to 1,313,621.20, 1,970,431.80 and 864,848.80 is: 1,297,273.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313,621.20 : 1,970,431.80 = 864,848.80 : x
  2. Step 2: Convert to fraction form
    1,313,621.20/1,970,431.80 = 864,848.80/x
  3. Step 3: Cross multiply
    1,313,621.20x = 1,970,431.80 × 864,848.80
  4. Step 4: Simplify right side
    1,313,621.20x = 1,704,125,577,711.84
  5. Step 5: Solve for x
    x = 1,704,125,577,711.84/1,313,621.20
  6. Step 6: Final answer
    x = 1,297,273.20

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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.