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Finding the Fourth Proportional to 553.09, 828.70 and 389.98

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Solution

The fourth proportional to 553.09, 828.70 and 389.98 is: 584.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.09 : 828.70 = 389.98 : x
  2. Step 2: Convert to fraction form
    553.09/828.70 = 389.98/x
  3. Step 3: Cross multiply
    553.09x = 828.70 × 389.98
  4. Step 4: Simplify right side
    553.09x = 323,176.43
  5. Step 5: Solve for x
    x = 323,176.43/553.09
  6. Step 6: Final answer
    x = 584.31

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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.