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Finding the Fourth Proportional to 443.81, 665.65 and 119.20

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Solution

The fourth proportional to 443.81, 665.65 and 119.20 is: 178.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.81 : 665.65 = 119.20 : x
  2. Step 2: Convert to fraction form
    443.81/665.65 = 119.20/x
  3. Step 3: Cross multiply
    443.81x = 665.65 × 119.20
  4. Step 4: Simplify right side
    443.81x = 79,345.48
  5. Step 5: Solve for x
    x = 79,345.48/443.81
  6. Step 6: Final answer
    x = 178.78

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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.