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Finding the Fourth Proportional to 258.33, 387.78 and 104.37

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Solution

The fourth proportional to 258.33, 387.78 and 104.37 is: 156.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.33 : 387.78 = 104.37 : x
  2. Step 2: Convert to fraction form
    258.33/387.78 = 104.37/x
  3. Step 3: Cross multiply
    258.33x = 387.78 × 104.37
  4. Step 4: Simplify right side
    258.33x = 40,472.60
  5. Step 5: Solve for x
    x = 40,472.60/258.33
  6. Step 6: Final answer
    x = 156.67

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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.