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Finding the Fourth Proportional to 443.38, 660.37 and 420.25

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Solution

The fourth proportional to 443.38, 660.37 and 420.25 is: 625.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.38 : 660.37 = 420.25 : x
  2. Step 2: Convert to fraction form
    443.38/660.37 = 420.25/x
  3. Step 3: Cross multiply
    443.38x = 660.37 × 420.25
  4. Step 4: Simplify right side
    443.38x = 277,520.49
  5. Step 5: Solve for x
    x = 277,520.49/443.38
  6. Step 6: Final answer
    x = 625.92

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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.