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Finding the Fourth Proportional to 443.56, 664.62 and 421.24

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Solution

The fourth proportional to 443.56, 664.62 and 421.24 is: 631.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.56 : 664.62 = 421.24 : x
  2. Step 2: Convert to fraction form
    443.56/664.62 = 421.24/x
  3. Step 3: Cross multiply
    443.56x = 664.62 × 421.24
  4. Step 4: Simplify right side
    443.56x = 279,964.53
  5. Step 5: Solve for x
    x = 279,964.53/443.56
  6. Step 6: Final answer
    x = 631.18

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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.