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Finding the Fourth Proportional to 823.55, 1,235.31 and 275.69

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Solution

The fourth proportional to 823.55, 1,235.31 and 275.69 is: 413.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.55 : 1,235.31 = 275.69 : x
  2. Step 2: Convert to fraction form
    823.55/1,235.31 = 275.69/x
  3. Step 3: Cross multiply
    823.55x = 1,235.31 × 275.69
  4. Step 4: Simplify right side
    823.55x = 340,562.61
  5. Step 5: Solve for x
    x = 340,562.61/823.55
  6. Step 6: Final answer
    x = 413.53

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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.