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Finding the Fourth Proportional to 403.56, 605.18 and 211.08

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Solution

The fourth proportional to 403.56, 605.18 and 211.08 is: 316.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.56 : 605.18 = 211.08 : x
  2. Step 2: Convert to fraction form
    403.56/605.18 = 211.08/x
  3. Step 3: Cross multiply
    403.56x = 605.18 × 211.08
  4. Step 4: Simplify right side
    403.56x = 127,741.39
  5. Step 5: Solve for x
    x = 127,741.39/403.56
  6. Step 6: Final answer
    x = 316.54

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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.