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Finding the Fourth Proportional to 321.06, 442.85 and 310.35

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Solution

The fourth proportional to 321.06, 442.85 and 310.35 is: 428.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.06 : 442.85 = 310.35 : x
  2. Step 2: Convert to fraction form
    321.06/442.85 = 310.35/x
  3. Step 3: Cross multiply
    321.06x = 442.85 × 310.35
  4. Step 4: Simplify right side
    321.06x = 137,438.50
  5. Step 5: Solve for x
    x = 137,438.50/321.06
  6. Step 6: Final answer
    x = 428.08

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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.