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Finding the Fourth Proportional to 420.44, 630.81 and 203.96

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Solution

The fourth proportional to 420.44, 630.81 and 203.96 is: 306.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.44 : 630.81 = 203.96 : x
  2. Step 2: Convert to fraction form
    420.44/630.81 = 203.96/x
  3. Step 3: Cross multiply
    420.44x = 630.81 × 203.96
  4. Step 4: Simplify right side
    420.44x = 128,660.01
  5. Step 5: Solve for x
    x = 128,660.01/420.44
  6. Step 6: Final answer
    x = 306.01

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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.