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Finding the Fourth Proportional to 823.40, 1,234.82 and 275.48

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Solution

The fourth proportional to 823.40, 1,234.82 and 275.48 is: 413.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.40 : 1,234.82 = 275.48 : x
  2. Step 2: Convert to fraction form
    823.40/1,234.82 = 275.48/x
  3. Step 3: Cross multiply
    823.40x = 1,234.82 × 275.48
  4. Step 4: Simplify right side
    823.40x = 340,168.21
  5. Step 5: Solve for x
    x = 340,168.21/823.40
  6. Step 6: Final answer
    x = 413.13

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1.5x scale

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.