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Finding the Fourth Proportional to 260.36, 390.63 and 138.71

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Solution

The fourth proportional to 260.36, 390.63 and 138.71 is: 208.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.36 : 390.63 = 138.71 : x
  2. Step 2: Convert to fraction form
    260.36/390.63 = 138.71/x
  3. Step 3: Cross multiply
    260.36x = 390.63 × 138.71
  4. Step 4: Simplify right side
    260.36x = 54,184.29
  5. Step 5: Solve for x
    x = 54,184.29/260.36
  6. Step 6: Final answer
    x = 208.11

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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.