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Finding the Fourth Proportional to 485.67, 728.05 and 447.19

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Solution

The fourth proportional to 485.67, 728.05 and 447.19 is: 670.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.67 : 728.05 = 447.19 : x
  2. Step 2: Convert to fraction form
    485.67/728.05 = 447.19/x
  3. Step 3: Cross multiply
    485.67x = 728.05 × 447.19
  4. Step 4: Simplify right side
    485.67x = 325,576.68
  5. Step 5: Solve for x
    x = 325,576.68/485.67
  6. Step 6: Final answer
    x = 670.37

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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.