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Finding the Fourth Proportional to 485.20, 727.67 and 238.28

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Solution

The fourth proportional to 485.20, 727.67 and 238.28 is: 357.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.20 : 727.67 = 238.28 : x
  2. Step 2: Convert to fraction form
    485.20/727.67 = 238.28/x
  3. Step 3: Cross multiply
    485.20x = 727.67 × 238.28
  4. Step 4: Simplify right side
    485.20x = 173,389.21
  5. Step 5: Solve for x
    x = 173,389.21/485.20
  6. Step 6: Final answer
    x = 357.36

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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.