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Finding the Fourth Proportional to 822.48, 1,233.24 and 390

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Solution

The fourth proportional to 822.48, 1,233.24 and 390 is: 584.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.48 : 1,233.24 = 390 : x
  2. Step 2: Convert to fraction form
    822.48/1,233.24 = 390/x
  3. Step 3: Cross multiply
    822.48x = 1,233.24 × 390
  4. Step 4: Simplify right side
    822.48x = 480,963.60
  5. Step 5: Solve for x
    x = 480,963.60/822.48
  6. Step 6: Final answer
    x = 584.77

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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.