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Finding the Fourth Proportional to 381.06, 571.10 and 218.40

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Solution

The fourth proportional to 381.06, 571.10 and 218.40 is: 327.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.06 : 571.10 = 218.40 : x
  2. Step 2: Convert to fraction form
    381.06/571.10 = 218.40/x
  3. Step 3: Cross multiply
    381.06x = 571.10 × 218.40
  4. Step 4: Simplify right side
    381.06x = 124,728.24
  5. Step 5: Solve for x
    x = 124,728.24/381.06
  6. Step 6: Final answer
    x = 327.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.