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Finding the Fourth Proportional to 823.87, 1,235.80 and 247.15

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Solution

The fourth proportional to 823.87, 1,235.80 and 247.15 is: 370.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.87 : 1,235.80 = 247.15 : x
  2. Step 2: Convert to fraction form
    823.87/1,235.80 = 247.15/x
  3. Step 3: Cross multiply
    823.87x = 1,235.80 × 247.15
  4. Step 4: Simplify right side
    823.87x = 305,427.97
  5. Step 5: Solve for x
    x = 305,427.97/823.87
  6. Step 6: Final answer
    x = 370.72

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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.