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Finding the Fourth Proportional to 443.75, 664.61 and 280.94

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Solution

The fourth proportional to 443.75, 664.61 and 280.94 is: 420.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.75 : 664.61 = 280.94 : x
  2. Step 2: Convert to fraction form
    443.75/664.61 = 280.94/x
  3. Step 3: Cross multiply
    443.75x = 664.61 × 280.94
  4. Step 4: Simplify right side
    443.75x = 186,710.81
  5. Step 5: Solve for x
    x = 186,710.81/443.75
  6. Step 6: Final answer
    x = 420.76

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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.