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Finding the Fourth Proportional to 485.12, 728.13 and 254.18

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Solution

The fourth proportional to 485.12, 728.13 and 254.18 is: 381.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.12 : 728.13 = 254.18 : x
  2. Step 2: Convert to fraction form
    485.12/728.13 = 254.18/x
  3. Step 3: Cross multiply
    485.12x = 728.13 × 254.18
  4. Step 4: Simplify right side
    485.12x = 185,072.44
  5. Step 5: Solve for x
    x = 185,072.44/485.12
  6. Step 6: Final answer
    x = 381.50

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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.