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Finding the Fourth Proportional to 402.36, 553.94 and 381.84

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Solution

The fourth proportional to 402.36, 553.94 and 381.84 is: 525.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.36 : 553.94 = 381.84 : x
  2. Step 2: Convert to fraction form
    402.36/553.94 = 381.84/x
  3. Step 3: Cross multiply
    402.36x = 553.94 × 381.84
  4. Step 4: Simplify right side
    402.36x = 211,516.45
  5. Step 5: Solve for x
    x = 211,516.45/402.36
  6. Step 6: Final answer
    x = 525.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.