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Finding the Fourth Proportional to 443.28, 665.08 and 272.40

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Solution

The fourth proportional to 443.28, 665.08 and 272.40 is: 408.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.28 : 665.08 = 272.40 : x
  2. Step 2: Convert to fraction form
    443.28/665.08 = 272.40/x
  3. Step 3: Cross multiply
    443.28x = 665.08 × 272.40
  4. Step 4: Simplify right side
    443.28x = 181,167.79
  5. Step 5: Solve for x
    x = 181,167.79/443.28
  6. Step 6: Final answer
    x = 408.70

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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.