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Finding the Fourth Proportional to 322.60, 485 and 321

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Solution

The fourth proportional to 322.60, 485 and 321 is: 482.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.60 : 485 = 321 : x
  2. Step 2: Convert to fraction form
    322.60/485 = 321/x
  3. Step 3: Cross multiply
    322.60x = 485 × 321
  4. Step 4: Simplify right side
    322.60x = 155,685
  5. Step 5: Solve for x
    x = 155,685/322.60
  6. Step 6: Final answer
    x = 482.59

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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.