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Finding the Fourth Proportional to 811.95, 1,218.05 and 324.99

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Solution

The fourth proportional to 811.95, 1,218.05 and 324.99 is: 487.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.95 : 1,218.05 = 324.99 : x
  2. Step 2: Convert to fraction form
    811.95/1,218.05 = 324.99/x
  3. Step 3: Cross multiply
    811.95x = 1,218.05 × 324.99
  4. Step 4: Simplify right side
    811.95x = 395,852.44
  5. Step 5: Solve for x
    x = 395,852.44/811.95
  6. Step 6: Final answer
    x = 487.53

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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.