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Finding the Fourth Proportional to 618.11, 852.68 and 393.98

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Solution

The fourth proportional to 618.11, 852.68 and 393.98 is: 543.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.11 : 852.68 = 393.98 : x
  2. Step 2: Convert to fraction form
    618.11/852.68 = 393.98/x
  3. Step 3: Cross multiply
    618.11x = 852.68 × 393.98
  4. Step 4: Simplify right side
    618.11x = 335,936.90
  5. Step 5: Solve for x
    x = 335,936.90/618.11
  6. Step 6: Final answer
    x = 543.49

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.