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Finding the Fourth Proportional to 403.77, 605.43 and 143.67

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Solution

The fourth proportional to 403.77, 605.43 and 143.67 is: 215.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.77 : 605.43 = 143.67 : x
  2. Step 2: Convert to fraction form
    403.77/605.43 = 143.67/x
  3. Step 3: Cross multiply
    403.77x = 605.43 × 143.67
  4. Step 4: Simplify right side
    403.77x = 86,982.13
  5. Step 5: Solve for x
    x = 86,982.13/403.77
  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.