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Finding the Fourth Proportional to 303.81, 419.20 and 172.79

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Solution

The fourth proportional to 303.81, 419.20 and 172.79 is: 238.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.81 : 419.20 = 172.79 : x
  2. Step 2: Convert to fraction form
    303.81/419.20 = 172.79/x
  3. Step 3: Cross multiply
    303.81x = 419.20 × 172.79
  4. Step 4: Simplify right side
    303.81x = 72,433.57
  5. Step 5: Solve for x
    x = 72,433.57/303.81
  6. Step 6: Final answer
    x = 238.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.