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Finding the Fourth Proportional to 553.19, 827.96 and 388.85

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Solution

The fourth proportional to 553.19, 827.96 and 388.85 is: 581.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.19 : 827.96 = 388.85 : x
  2. Step 2: Convert to fraction form
    553.19/827.96 = 388.85/x
  3. Step 3: Cross multiply
    553.19x = 827.96 × 388.85
  4. Step 4: Simplify right side
    553.19x = 321,946.16
  5. Step 5: Solve for x
    x = 321,946.16/553.19
  6. Step 6: Final answer
    x = 581.99

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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.