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Finding the Fourth Proportional to 485.34, 730.62 and 418.37

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Solution

The fourth proportional to 485.34, 730.62 and 418.37 is: 629.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.34 : 730.62 = 418.37 : x
  2. Step 2: Convert to fraction form
    485.34/730.62 = 418.37/x
  3. Step 3: Cross multiply
    485.34x = 730.62 × 418.37
  4. Step 4: Simplify right side
    485.34x = 305,665.84
  5. Step 5: Solve for x
    x = 305,665.84/485.34
  6. Step 6: Final answer
    x = 629.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.