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Finding the Fourth Proportional to 490.35, 736.16 and 421.39

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Solution

The fourth proportional to 490.35, 736.16 and 421.39 is: 632.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.35 : 736.16 = 421.39 : x
  2. Step 2: Convert to fraction form
    490.35/736.16 = 421.39/x
  3. Step 3: Cross multiply
    490.35x = 736.16 × 421.39
  4. Step 4: Simplify right side
    490.35x = 310,205.13
  5. Step 5: Solve for x
    x = 310,205.13/490.35
  6. Step 6: Final answer
    x = 632.61

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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.