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Finding the Fourth Proportional to 353.60, 486.84 and 321.20

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Solution

The fourth proportional to 353.60, 486.84 and 321.20 is: 442.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.60 : 486.84 = 321.20 : x
  2. Step 2: Convert to fraction form
    353.60/486.84 = 321.20/x
  3. Step 3: Cross multiply
    353.60x = 486.84 × 321.20
  4. Step 4: Simplify right side
    353.60x = 156,373.01
  5. Step 5: Solve for x
    x = 156,373.01/353.60
  6. Step 6: Final answer
    x = 442.23

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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.