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Finding the Fourth Proportional to 403.46, 605.54 and 211.22

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Solution

The fourth proportional to 403.46, 605.54 and 211.22 is: 317.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.46 : 605.54 = 211.22 : x
  2. Step 2: Convert to fraction form
    403.46/605.54 = 211.22/x
  3. Step 3: Cross multiply
    403.46x = 605.54 × 211.22
  4. Step 4: Simplify right side
    403.46x = 127,899.66
  5. Step 5: Solve for x
    x = 127,899.66/403.46
  6. Step 6: Final answer
    x = 317.01

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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.