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Finding the Fourth Proportional to 393.72, 543.32 and 216.68

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Solution

The fourth proportional to 393.72, 543.32 and 216.68 is: 299.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.72 : 543.32 = 216.68 : x
  2. Step 2: Convert to fraction form
    393.72/543.32 = 216.68/x
  3. Step 3: Cross multiply
    393.72x = 543.32 × 216.68
  4. Step 4: Simplify right side
    393.72x = 117,722.78
  5. Step 5: Solve for x
    x = 117,722.78/393.72
  6. Step 6: Final answer
    x = 299.00

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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.