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Finding the Fourth Proportional to 338.77, 508.31 and 143.81

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Solution

The fourth proportional to 338.77, 508.31 and 143.81 is: 215.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.77 : 508.31 = 143.81 : x
  2. Step 2: Convert to fraction form
    338.77/508.31 = 143.81/x
  3. Step 3: Cross multiply
    338.77x = 508.31 × 143.81
  4. Step 4: Simplify right side
    338.77x = 73,100.68
  5. Step 5: Solve for x
    x = 73,100.68/338.77
  6. Step 6: Final answer
    x = 215.79

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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.