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Finding the Fourth Proportional to 443.74, 665.61 and 431.59

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Solution

The fourth proportional to 443.74, 665.61 and 431.59 is: 647.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.74 : 665.61 = 431.59 : x
  2. Step 2: Convert to fraction form
    443.74/665.61 = 431.59/x
  3. Step 3: Cross multiply
    443.74x = 665.61 × 431.59
  4. Step 4: Simplify right side
    443.74x = 287,270.62
  5. Step 5: Solve for x
    x = 287,270.62/443.74
  6. Step 6: Final answer
    x = 647.39

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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.