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Finding the Fourth Proportional to 381.38, 526.28 and 215.60

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Solution

The fourth proportional to 381.38, 526.28 and 215.60 is: 297.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.38 : 526.28 = 215.60 : x
  2. Step 2: Convert to fraction form
    381.38/526.28 = 215.60/x
  3. Step 3: Cross multiply
    381.38x = 526.28 × 215.60
  4. Step 4: Simplify right side
    381.38x = 113,465.97
  5. Step 5: Solve for x
    x = 113,465.97/381.38
  6. Step 6: Final answer
    x = 297.51

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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.