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Finding the Fourth Proportional to 811.82, 1,218.24 and 617.05

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Solution

The fourth proportional to 811.82, 1,218.24 and 617.05 is: 925.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.82 : 1,218.24 = 617.05 : x
  2. Step 2: Convert to fraction form
    811.82/1,218.24 = 617.05/x
  3. Step 3: Cross multiply
    811.82x = 1,218.24 × 617.05
  4. Step 4: Simplify right side
    811.82x = 751,716.51
  5. Step 5: Solve for x
    x = 751,716.51/811.82
  6. Step 6: Final answer
    x = 925.96

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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.