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Finding the Fourth Proportional to 823.80, 1,235.08 and 709.59

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Solution

The fourth proportional to 823.80, 1,235.08 and 709.59 is: 1,063.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.80 : 1,235.08 = 709.59 : x
  2. Step 2: Convert to fraction form
    823.80/1,235.08 = 709.59/x
  3. Step 3: Cross multiply
    823.80x = 1,235.08 × 709.59
  4. Step 4: Simplify right side
    823.80x = 876,405.94
  5. Step 5: Solve for x
    x = 876,405.94/823.80
  6. Step 6: Final answer
    x = 1,063.85

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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.