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Finding the Fourth Proportional to 381.76, 526.89 and 215.97

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Solution

The fourth proportional to 381.76, 526.89 and 215.97 is: 298.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.76 : 526.89 = 215.97 : x
  2. Step 2: Convert to fraction form
    381.76/526.89 = 215.97/x
  3. Step 3: Cross multiply
    381.76x = 526.89 × 215.97
  4. Step 4: Simplify right side
    381.76x = 113,794.50
  5. Step 5: Solve for x
    x = 113,794.50/381.76
  6. Step 6: Final answer
    x = 298.08

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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.