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Finding the Fourth Proportional to 790.43, 1,185.21 and 321.48

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Solution

The fourth proportional to 790.43, 1,185.21 and 321.48 is: 482.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.43 : 1,185.21 = 321.48 : x
  2. Step 2: Convert to fraction form
    790.43/1,185.21 = 321.48/x
  3. Step 3: Cross multiply
    790.43x = 1,185.21 × 321.48
  4. Step 4: Simplify right side
    790.43x = 381,021.31
  5. Step 5: Solve for x
    x = 381,021.31/790.43
  6. Step 6: Final answer
    x = 482.05

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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.