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Finding the Fourth Proportional to 321,078.60, 481,690.80 and 187,890.30

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Solution

The fourth proportional to 321,078.60, 481,690.80 and 187,890.30 is: 281,878.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,078.60 : 481,690.80 = 187,890.30 : x
  2. Step 2: Convert to fraction form
    321,078.60/481,690.80 = 187,890.30/x
  3. Step 3: Cross multiply
    321,078.60x = 481,690.80 × 187,890.30
  4. Step 4: Simplify right side
    321,078.60x = 90,505,028,919.24
  5. Step 5: Solve for x
    x = 90,505,028,919.24/321,078.60
  6. Step 6: Final answer
    x = 281,878.11

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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.