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Finding the Fourth Proportional to 385.19, 576.48 and 321.13

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Solution

The fourth proportional to 385.19, 576.48 and 321.13 is: 480.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.19 : 576.48 = 321.13 : x
  2. Step 2: Convert to fraction form
    385.19/576.48 = 321.13/x
  3. Step 3: Cross multiply
    385.19x = 576.48 × 321.13
  4. Step 4: Simplify right side
    385.19x = 185,125.02
  5. Step 5: Solve for x
    x = 185,125.02/385.19
  6. Step 6: Final answer
    x = 480.61

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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.