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Finding the Fourth Proportional to 812.15, 1,216.79 and 554.39

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Solution

The fourth proportional to 812.15, 1,216.79 and 554.39 is: 830.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.15 : 1,216.79 = 554.39 : x
  2. Step 2: Convert to fraction form
    812.15/1,216.79 = 554.39/x
  3. Step 3: Cross multiply
    812.15x = 1,216.79 × 554.39
  4. Step 4: Simplify right side
    812.15x = 674,573.44
  5. Step 5: Solve for x
    x = 674,573.44/812.15
  6. Step 6: Final answer
    x = 830.60

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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.