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Finding the Fourth Proportional to 330.35, 494.30 and 257.45

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Solution

The fourth proportional to 330.35, 494.30 and 257.45 is: 385.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.35 : 494.30 = 257.45 : x
  2. Step 2: Convert to fraction form
    330.35/494.30 = 257.45/x
  3. Step 3: Cross multiply
    330.35x = 494.30 × 257.45
  4. Step 4: Simplify right side
    330.35x = 127,255.71
  5. Step 5: Solve for x
    x = 127,255.71/330.35
  6. Step 6: Final answer
    x = 385.22

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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.