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Finding the Fourth Proportional to 403.74, 605.43 and 143.66

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Solution

The fourth proportional to 403.74, 605.43 and 143.66 is: 215.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.74 : 605.43 = 143.66 : x
  2. Step 2: Convert to fraction form
    403.74/605.43 = 143.66/x
  3. Step 3: Cross multiply
    403.74x = 605.43 × 143.66
  4. Step 4: Simplify right side
    403.74x = 86,973.05
  5. Step 5: Solve for x
    x = 86,973.05/403.74
  6. Step 6: Final answer
    x = 215.42

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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.