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Finding the Fourth Proportional to 666.44, 914.79 and 591.11

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Solution

The fourth proportional to 666.44, 914.79 and 591.11 is: 811.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.44 : 914.79 = 591.11 : x
  2. Step 2: Convert to fraction form
    666.44/914.79 = 591.11/x
  3. Step 3: Cross multiply
    666.44x = 914.79 × 591.11
  4. Step 4: Simplify right side
    666.44x = 540,736.94
  5. Step 5: Solve for x
    x = 540,736.94/666.44
  6. Step 6: Final answer
    x = 811.39

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.