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Finding the Fourth Proportional to 818.06, 1,227.54 and 815.60

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Solution

The fourth proportional to 818.06, 1,227.54 and 815.60 is: 1,223.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.06 : 1,227.54 = 815.60 : x
  2. Step 2: Convert to fraction form
    818.06/1,227.54 = 815.60/x
  3. Step 3: Cross multiply
    818.06x = 1,227.54 × 815.60
  4. Step 4: Simplify right side
    818.06x = 1,001,181.62
  5. Step 5: Solve for x
    x = 1,001,181.62/818.06
  6. Step 6: Final answer
    x = 1,223.85

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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.