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Finding the Fourth Proportional to 330.96, 493.87 and 287.22

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Solution

The fourth proportional to 330.96, 493.87 and 287.22 is: 428.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.96 : 493.87 = 287.22 : x
  2. Step 2: Convert to fraction form
    330.96/493.87 = 287.22/x
  3. Step 3: Cross multiply
    330.96x = 493.87 × 287.22
  4. Step 4: Simplify right side
    330.96x = 141,849.34
  5. Step 5: Solve for x
    x = 141,849.34/330.96
  6. Step 6: Final answer
    x = 428.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.