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Finding the Fourth Proportional to 822.97, 1,235 and 390.25

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Solution

The fourth proportional to 822.97, 1,235 and 390.25 is: 585.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.97 : 1,235 = 390.25 : x
  2. Step 2: Convert to fraction form
    822.97/1,235 = 390.25/x
  3. Step 3: Cross multiply
    822.97x = 1,235 × 390.25
  4. Step 4: Simplify right side
    822.97x = 481,958.75
  5. Step 5: Solve for x
    x = 481,958.75/822.97
  6. Step 6: Final answer
    x = 585.63

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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.