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Finding the Fourth Proportional to 485.73, 728.64 and 211.95

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Solution

The fourth proportional to 485.73, 728.64 and 211.95 is: 317.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.73 : 728.64 = 211.95 : x
  2. Step 2: Convert to fraction form
    485.73/728.64 = 211.95/x
  3. Step 3: Cross multiply
    485.73x = 728.64 × 211.95
  4. Step 4: Simplify right side
    485.73x = 154,435.25
  5. Step 5: Solve for x
    x = 154,435.25/485.73
  6. Step 6: Final answer
    x = 317.94

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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.