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Finding the Fourth Proportional to 381.28, 526.14 and 215.50

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Solution

The fourth proportional to 381.28, 526.14 and 215.50 is: 297.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.28 : 526.14 = 215.50 : x
  2. Step 2: Convert to fraction form
    381.28/526.14 = 215.50/x
  3. Step 3: Cross multiply
    381.28x = 526.14 × 215.50
  4. Step 4: Simplify right side
    381.28x = 113,380.54
  5. Step 5: Solve for x
    x = 113,380.54/381.28
  6. Step 6: Final answer
    x = 297.37

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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.