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Finding the Fourth Proportional to 553.44, 829.84 and 391.20

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Solution

The fourth proportional to 553.44, 829.84 and 391.20 is: 586.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.44 : 829.84 = 391.20 : x
  2. Step 2: Convert to fraction form
    553.44/829.84 = 391.20/x
  3. Step 3: Cross multiply
    553.44x = 829.84 × 391.20
  4. Step 4: Simplify right side
    553.44x = 324,633.41
  5. Step 5: Solve for x
    x = 324,633.41/553.44
  6. Step 6: Final answer
    x = 586.57

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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.