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Finding the Fourth Proportional to 421.23, 630.89 and 225.89

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Solution

The fourth proportional to 421.23, 630.89 and 225.89 is: 338.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.23 : 630.89 = 225.89 : x
  2. Step 2: Convert to fraction form
    421.23/630.89 = 225.89/x
  3. Step 3: Cross multiply
    421.23x = 630.89 × 225.89
  4. Step 4: Simplify right side
    421.23x = 142,511.74
  5. Step 5: Solve for x
    x = 142,511.74/421.23
  6. Step 6: Final answer
    x = 338.32

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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.