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Finding the Fourth Proportional to 823.39, 1,235.40 and 275.65

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Solution

The fourth proportional to 823.39, 1,235.40 and 275.65 is: 413.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.39 : 1,235.40 = 275.65 : x
  2. Step 2: Convert to fraction form
    823.39/1,235.40 = 275.65/x
  3. Step 3: Cross multiply
    823.39x = 1,235.40 × 275.65
  4. Step 4: Simplify right side
    823.39x = 340,538.01
  5. Step 5: Solve for x
    x = 340,538.01/823.39
  6. Step 6: Final answer
    x = 413.58

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Double scale
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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.