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Finding the Fourth Proportional to 421.34, 630.66 and 238.16

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Solution

The fourth proportional to 421.34, 630.66 and 238.16 is: 356.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.34 : 630.66 = 238.16 : x
  2. Step 2: Convert to fraction form
    421.34/630.66 = 238.16/x
  3. Step 3: Cross multiply
    421.34x = 630.66 × 238.16
  4. Step 4: Simplify right side
    421.34x = 150,197.99
  5. Step 5: Solve for x
    x = 150,197.99/421.34
  6. Step 6: Final answer
    x = 356.48

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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.