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Finding the Fourth Proportional to 822.88, 1,232.88 and 389.44

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Solution

The fourth proportional to 822.88, 1,232.88 and 389.44 is: 583.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.88 : 1,232.88 = 389.44 : x
  2. Step 2: Convert to fraction form
    822.88/1,232.88 = 389.44/x
  3. Step 3: Cross multiply
    822.88x = 1,232.88 × 389.44
  4. Step 4: Simplify right side
    822.88x = 480,132.79
  5. Step 5: Solve for x
    x = 480,132.79/822.88
  6. Step 6: Final answer
    x = 583.48

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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.