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Finding the Fourth Proportional to 1,391.78, 2,087.69 and 365.78

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Solution

The fourth proportional to 1,391.78, 2,087.69 and 365.78 is: 548.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.78 : 2,087.69 = 365.78 : x
  2. Step 2: Convert to fraction form
    1,391.78/2,087.69 = 365.78/x
  3. Step 3: Cross multiply
    1,391.78x = 2,087.69 × 365.78
  4. Step 4: Simplify right side
    1,391.78x = 763,635.25
  5. Step 5: Solve for x
    x = 763,635.25/1,391.78
  6. Step 6: Final answer
    x = 548.68

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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.