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Finding the Fourth Proportional to 260.24, 390.19 and 86.87

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Solution

The fourth proportional to 260.24, 390.19 and 86.87 is: 130.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.24 : 390.19 = 86.87 : x
  2. Step 2: Convert to fraction form
    260.24/390.19 = 86.87/x
  3. Step 3: Cross multiply
    260.24x = 390.19 × 86.87
  4. Step 4: Simplify right side
    260.24x = 33,893.85
  5. Step 5: Solve for x
    x = 33,893.85/260.24
  6. Step 6: Final answer
    x = 130.24

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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.