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Finding the Fourth Proportional to 382.05, 526.50 and 315.43

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Solution

The fourth proportional to 382.05, 526.50 and 315.43 is: 434.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.05 : 526.50 = 315.43 : x
  2. Step 2: Convert to fraction form
    382.05/526.50 = 315.43/x
  3. Step 3: Cross multiply
    382.05x = 526.50 × 315.43
  4. Step 4: Simplify right side
    382.05x = 166,072.58
  5. Step 5: Solve for x
    x = 166,072.58/382.05
  6. Step 6: Final answer
    x = 434.69

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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.