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Finding the Fourth Proportional to 485.41, 669.97 and 319.65

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Solution

The fourth proportional to 485.41, 669.97 and 319.65 is: 441.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.41 : 669.97 = 319.65 : x
  2. Step 2: Convert to fraction form
    485.41/669.97 = 319.65/x
  3. Step 3: Cross multiply
    485.41x = 669.97 × 319.65
  4. Step 4: Simplify right side
    485.41x = 214,153.80
  5. Step 5: Solve for x
    x = 214,153.80/485.41
  6. Step 6: Final answer
    x = 441.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.