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Finding the Fourth Proportional to 553.56, 828.99 and 390.48

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Solution

The fourth proportional to 553.56, 828.99 and 390.48 is: 584.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.56 : 828.99 = 390.48 : x
  2. Step 2: Convert to fraction form
    553.56/828.99 = 390.48/x
  3. Step 3: Cross multiply
    553.56x = 828.99 × 390.48
  4. Step 4: Simplify right side
    553.56x = 323,704.02
  5. Step 5: Solve for x
    x = 323,704.02/553.56
  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.