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Finding the Fourth Proportional to 486.22, 727.58 and 421.44

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Solution

The fourth proportional to 486.22, 727.58 and 421.44 is: 630.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.22 : 727.58 = 421.44 : x
  2. Step 2: Convert to fraction form
    486.22/727.58 = 421.44/x
  3. Step 3: Cross multiply
    486.22x = 727.58 × 421.44
  4. Step 4: Simplify right side
    486.22x = 306,632.37
  5. Step 5: Solve for x
    x = 306,632.37/486.22
  6. Step 6: Final answer
    x = 630.65

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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.