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Finding the Fourth Proportional to 260.08, 390.00 and 86.69

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Solution

The fourth proportional to 260.08, 390.00 and 86.69 is: 129.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.08 : 390.00 = 86.69 : x
  2. Step 2: Convert to fraction form
    260.08/390.00 = 86.69/x
  3. Step 3: Cross multiply
    260.08x = 390.00 × 86.69
  4. Step 4: Simplify right side
    260.08x = 33,808.67
  5. Step 5: Solve for x
    x = 33,808.67/260.08
  6. Step 6: Final answer
    x = 129.99

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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.