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Finding the Fourth Proportional to 439.10, 654.90 and 423.62

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Solution

The fourth proportional to 439.10, 654.90 and 423.62 is: 631.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.10 : 654.90 = 423.62 : x
  2. Step 2: Convert to fraction form
    439.10/654.90 = 423.62/x
  3. Step 3: Cross multiply
    439.10x = 654.90 × 423.62
  4. Step 4: Simplify right side
    439.10x = 277,426.62
  5. Step 5: Solve for x
    x = 277,426.62/439.10
  6. Step 6: Final answer
    x = 631.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.