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Finding the Fourth Proportional to 381.54, 526.50 and 215.78

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Solution

The fourth proportional to 381.54, 526.50 and 215.78 is: 297.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.54 : 526.50 = 215.78 : x
  2. Step 2: Convert to fraction form
    381.54/526.50 = 215.78/x
  3. Step 3: Cross multiply
    381.54x = 526.50 × 215.78
  4. Step 4: Simplify right side
    381.54x = 113,608.17
  5. Step 5: Solve for x
    x = 113,608.17/381.54
  6. Step 6: Final answer
    x = 297.76

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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.