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Finding the Fourth Proportional to 321.06, 480.08 and 279.55

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Solution

The fourth proportional to 321.06, 480.08 and 279.55 is: 418.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.06 : 480.08 = 279.55 : x
  2. Step 2: Convert to fraction form
    321.06/480.08 = 279.55/x
  3. Step 3: Cross multiply
    321.06x = 480.08 × 279.55
  4. Step 4: Simplify right side
    321.06x = 134,206.09
  5. Step 5: Solve for x
    x = 134,206.09/321.06
  6. Step 6: Final answer
    x = 418.00

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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.