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Finding the Fourth Proportional to 485.35, 727.85 and 211.30

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Solution

The fourth proportional to 485.35, 727.85 and 211.30 is: 316.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.35 : 727.85 = 211.30 : x
  2. Step 2: Convert to fraction form
    485.35/727.85 = 211.30/x
  3. Step 3: Cross multiply
    485.35x = 727.85 × 211.30
  4. Step 4: Simplify right side
    485.35x = 153,793.41
  5. Step 5: Solve for x
    x = 153,793.41/485.35
  6. Step 6: Final answer
    x = 316.87

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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.