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Finding the Fourth Proportional to 260.15, 390.31 and 106.25

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Solution

The fourth proportional to 260.15, 390.31 and 106.25 is: 159.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.15 : 390.31 = 106.25 : x
  2. Step 2: Convert to fraction form
    260.15/390.31 = 106.25/x
  3. Step 3: Cross multiply
    260.15x = 390.31 × 106.25
  4. Step 4: Simplify right side
    260.15x = 41,468.22
  5. Step 5: Solve for x
    x = 41,468.22/260.15
  6. Step 6: Final answer
    x = 159.40

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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.