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Finding the Fourth Proportional to 443.42, 664.53 and 430.28

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Solution

The fourth proportional to 443.42, 664.53 and 430.28 is: 644.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.42 : 664.53 = 430.28 : x
  2. Step 2: Convert to fraction form
    443.42/664.53 = 430.28/x
  3. Step 3: Cross multiply
    443.42x = 664.53 × 430.28
  4. Step 4: Simplify right side
    443.42x = 285,933.97
  5. Step 5: Solve for x
    x = 285,933.97/443.42
  6. Step 6: Final answer
    x = 644.84

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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.