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Finding the Fourth Proportional to 443.93, 664.86 and 428.55

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Solution

The fourth proportional to 443.93, 664.86 and 428.55 is: 641.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.93 : 664.86 = 428.55 : x
  2. Step 2: Convert to fraction form
    443.93/664.86 = 428.55/x
  3. Step 3: Cross multiply
    443.93x = 664.86 × 428.55
  4. Step 4: Simplify right side
    443.93x = 284,925.75
  5. Step 5: Solve for x
    x = 284,925.75/443.93
  6. Step 6: Final answer
    x = 641.83

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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.