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Finding the Fourth Proportional to 961.67, 1,440.79 and 823.37

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Solution

The fourth proportional to 961.67, 1,440.79 and 823.37 is: 1,233.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.67 : 1,440.79 = 823.37 : x
  2. Step 2: Convert to fraction form
    961.67/1,440.79 = 823.37/x
  3. Step 3: Cross multiply
    961.67x = 1,440.79 × 823.37
  4. Step 4: Simplify right side
    961.67x = 1,186,294.00
  5. Step 5: Solve for x
    x = 1,186,294.00/961.67
  6. Step 6: Final answer
    x = 1,233.57

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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.