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Finding the Fourth Proportional to 381.20, 526.16 and 248.79

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Solution

The fourth proportional to 381.20, 526.16 and 248.79 is: 343.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.20 : 526.16 = 248.79 : x
  2. Step 2: Convert to fraction form
    381.20/526.16 = 248.79/x
  3. Step 3: Cross multiply
    381.20x = 526.16 × 248.79
  4. Step 4: Simplify right side
    381.20x = 130,903.35
  5. Step 5: Solve for x
    x = 130,903.35/381.20
  6. Step 6: Final answer
    x = 343.40

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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.