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Finding the Fourth Proportional to 818.25, 1,227.38 and 210.25

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Solution

The fourth proportional to 818.25, 1,227.38 and 210.25 is: 315.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.25 : 1,227.38 = 210.25 : x
  2. Step 2: Convert to fraction form
    818.25/1,227.38 = 210.25/x
  3. Step 3: Cross multiply
    818.25x = 1,227.38 × 210.25
  4. Step 4: Simplify right side
    818.25x = 258,056.65
  5. Step 5: Solve for x
    x = 258,056.65/818.25
  6. Step 6: Final answer
    x = 315.38

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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.