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Finding the Fourth Proportional to 260.59, 390.89 and 68.22

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Solution

The fourth proportional to 260.59, 390.89 and 68.22 is: 102.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.59 : 390.89 = 68.22 : x
  2. Step 2: Convert to fraction form
    260.59/390.89 = 68.22/x
  3. Step 3: Cross multiply
    260.59x = 390.89 × 68.22
  4. Step 4: Simplify right side
    260.59x = 26,666.52
  5. Step 5: Solve for x
    x = 26,666.52/260.59
  6. Step 6: Final answer
    x = 102.33

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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.