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Finding the Fourth Proportional to 822.98, 1,233.66 and 390.44

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Solution

The fourth proportional to 822.98, 1,233.66 and 390.44 is: 585.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.98 : 1,233.66 = 390.44 : x
  2. Step 2: Convert to fraction form
    822.98/1,233.66 = 390.44/x
  3. Step 3: Cross multiply
    822.98x = 1,233.66 × 390.44
  4. Step 4: Simplify right side
    822.98x = 481,670.21
  5. Step 5: Solve for x
    x = 481,670.21/822.98
  6. Step 6: Final answer
    x = 585.28

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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.