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Finding the Fourth Proportional to 421.49, 631.32 and 204.62

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Solution

The fourth proportional to 421.49, 631.32 and 204.62 is: 306.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.49 : 631.32 = 204.62 : x
  2. Step 2: Convert to fraction form
    421.49/631.32 = 204.62/x
  3. Step 3: Cross multiply
    421.49x = 631.32 × 204.62
  4. Step 4: Simplify right side
    421.49x = 129,176.77
  5. Step 5: Solve for x
    x = 129,176.77/421.49
  6. Step 6: Final answer
    x = 306.47

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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.