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Finding the Fourth Proportional to 823.81, 1,235.45 and 275.85

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Solution

The fourth proportional to 823.81, 1,235.45 and 275.85 is: 413.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.81 : 1,235.45 = 275.85 : x
  2. Step 2: Convert to fraction form
    823.81/1,235.45 = 275.85/x
  3. Step 3: Cross multiply
    823.81x = 1,235.45 × 275.85
  4. Step 4: Simplify right side
    823.81x = 340,798.88
  5. Step 5: Solve for x
    x = 340,798.88/823.81
  6. Step 6: Final answer
    x = 413.69

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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.