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Finding the Fourth Proportional to 382.80, 574.20 and 315.30

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Solution

The fourth proportional to 382.80, 574.20 and 315.30 is: 472.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.80 : 574.20 = 315.30 : x
  2. Step 2: Convert to fraction form
    382.80/574.20 = 315.30/x
  3. Step 3: Cross multiply
    382.80x = 574.20 × 315.30
  4. Step 4: Simplify right side
    382.80x = 181,045.26
  5. Step 5: Solve for x
    x = 181,045.26/382.80
  6. Step 6: Final answer
    x = 472.95

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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.