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Finding the Fourth Proportional to 260.33, 390.50 and 138.60

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Solution

The fourth proportional to 260.33, 390.50 and 138.60 is: 207.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.33 : 390.50 = 138.60 : x
  2. Step 2: Convert to fraction form
    260.33/390.50 = 138.60/x
  3. Step 3: Cross multiply
    260.33x = 390.50 × 138.60
  4. Step 4: Simplify right side
    260.33x = 54,121.39
  5. Step 5: Solve for x
    x = 54,121.39/260.33
  6. Step 6: Final answer
    x = 207.89

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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.