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Finding the Fourth Proportional to 321,022.90, 481,731.18 and 143,679.88

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Solution

The fourth proportional to 321,022.90, 481,731.18 and 143,679.88 is: 215,607.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,022.90 : 481,731.18 = 143,679.88 : x
  2. Step 2: Convert to fraction form
    321,022.90/481,731.18 = 143,679.88/x
  3. Step 3: Cross multiply
    321,022.90x = 481,731.18 × 143,679.88
  4. Step 4: Simplify right side
    321,022.90x = 69,215,078,134.66
  5. Step 5: Solve for x
    x = 69,215,078,134.66/321,022.90
  6. Step 6: Final answer
    x = 215,607.91

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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.