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Finding the Fourth Proportional to 822.36, 1,231.26 and 640.11

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Solution

The fourth proportional to 822.36, 1,231.26 and 640.11 is: 958.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.36 : 1,231.26 = 640.11 : x
  2. Step 2: Convert to fraction form
    822.36/1,231.26 = 640.11/x
  3. Step 3: Cross multiply
    822.36x = 1,231.26 × 640.11
  4. Step 4: Simplify right side
    822.36x = 788,141.84
  5. Step 5: Solve for x
    x = 788,141.84/822.36
  6. Step 6: Final answer
    x = 958.39

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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.