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Finding the Fourth Proportional to 379.55, 522.85 and 330.35

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Solution

The fourth proportional to 379.55, 522.85 and 330.35 is: 455.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.55 : 522.85 = 330.35 : x
  2. Step 2: Convert to fraction form
    379.55/522.85 = 330.35/x
  3. Step 3: Cross multiply
    379.55x = 522.85 × 330.35
  4. Step 4: Simplify right side
    379.55x = 172,723.50
  5. Step 5: Solve for x
    x = 172,723.50/379.55
  6. Step 6: Final answer
    x = 455.07

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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.