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Finding the Fourth Proportional to 260.94, 390.74 and 138.93

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Solution

The fourth proportional to 260.94, 390.74 and 138.93 is: 208.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.94 : 390.74 = 138.93 : x
  2. Step 2: Convert to fraction form
    260.94/390.74 = 138.93/x
  3. Step 3: Cross multiply
    260.94x = 390.74 × 138.93
  4. Step 4: Simplify right side
    260.94x = 54,284.81
  5. Step 5: Solve for x
    x = 54,284.81/260.94
  6. Step 6: Final answer
    x = 208.04

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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.