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Finding the Fourth Proportional to 823.84, 1,235.94 and 391.48

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Solution

The fourth proportional to 823.84, 1,235.94 and 391.48 is: 587.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.84 : 1,235.94 = 391.48 : x
  2. Step 2: Convert to fraction form
    823.84/1,235.94 = 391.48/x
  3. Step 3: Cross multiply
    823.84x = 1,235.94 × 391.48
  4. Step 4: Simplify right side
    823.84x = 483,845.79
  5. Step 5: Solve for x
    x = 483,845.79/823.84
  6. Step 6: Final answer
    x = 587.31

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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.