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Finding the Fourth Proportional to 485.38, 665.01 and 479.31

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Solution

The fourth proportional to 485.38, 665.01 and 479.31 is: 656.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.38 : 665.01 = 479.31 : x
  2. Step 2: Convert to fraction form
    485.38/665.01 = 479.31/x
  3. Step 3: Cross multiply
    485.38x = 665.01 × 479.31
  4. Step 4: Simplify right side
    485.38x = 318,745.94
  5. Step 5: Solve for x
    x = 318,745.94/485.38
  6. Step 6: Final answer
    x = 656.69

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.