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Finding the Fourth Proportional to 420.63, 631.17 and 238.11

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Solution

The fourth proportional to 420.63, 631.17 and 238.11 is: 357.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.63 : 631.17 = 238.11 : x
  2. Step 2: Convert to fraction form
    420.63/631.17 = 238.11/x
  3. Step 3: Cross multiply
    420.63x = 631.17 × 238.11
  4. Step 4: Simplify right side
    420.63x = 150,287.89
  5. Step 5: Solve for x
    x = 150,287.89/420.63
  6. Step 6: Final answer
    x = 357.29

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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.