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Finding the Fourth Proportional to 321, 443.08 and 284.28

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Solution

The fourth proportional to 321, 443.08 and 284.28 is: 392.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    321 : 443.08 = 284.28 : x
  2. Step 2: Convert to fraction form
    321/443.08 = 284.28/x
  3. Step 3: Cross multiply
    321x = 443.08 × 284.28
  4. Step 4: Simplify right side
    321x = 125,958.78
  5. Step 5: Solve for x
    x = 125,958.78/321
  6. Step 6: Final answer
    x = 392.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.