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Finding the Fourth Proportional to 553.43, 829.22 and 390.84

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Solution

The fourth proportional to 553.43, 829.22 and 390.84 is: 585.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.43 : 829.22 = 390.84 : x
  2. Step 2: Convert to fraction form
    553.43/829.22 = 390.84/x
  3. Step 3: Cross multiply
    553.43x = 829.22 × 390.84
  4. Step 4: Simplify right side
    553.43x = 324,090.39
  5. Step 5: Solve for x
    x = 324,090.39/553.43
  6. Step 6: Final answer
    x = 585.61

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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.