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Finding the Fourth Proportional to 260.39, 390.75 and 138.74

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Solution

The fourth proportional to 260.39, 390.75 and 138.74 is: 208.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.39 : 390.75 = 138.74 : x
  2. Step 2: Convert to fraction form
    260.39/390.75 = 138.74/x
  3. Step 3: Cross multiply
    260.39x = 390.75 × 138.74
  4. Step 4: Simplify right side
    260.39x = 54,210.70
  5. Step 5: Solve for x
    x = 54,210.70/260.39
  6. Step 6: Final answer
    x = 208.19

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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.