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Finding the Fourth Proportional to 381.28, 526.17 and 215.50

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Solution

The fourth proportional to 381.28, 526.17 and 215.50 is: 297.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.28 : 526.17 = 215.50 : x
  2. Step 2: Convert to fraction form
    381.28/526.17 = 215.50/x
  3. Step 3: Cross multiply
    381.28x = 526.17 × 215.50
  4. Step 4: Simplify right side
    381.28x = 113,389.13
  5. Step 5: Solve for x
    x = 113,389.13/381.28
  6. Step 6: Final answer
    x = 297.39

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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.