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Finding the Fourth Proportional to 553.10, 828.44 and 399.33

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Solution

The fourth proportional to 553.10, 828.44 and 399.33 is: 598.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.10 : 828.44 = 399.33 : x
  2. Step 2: Convert to fraction form
    553.10/828.44 = 399.33/x
  3. Step 3: Cross multiply
    553.10x = 828.44 × 399.33
  4. Step 4: Simplify right side
    553.10x = 330,818.95
  5. Step 5: Solve for x
    x = 330,818.95/553.10
  6. Step 6: Final answer
    x = 598.12

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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.