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Finding the Fourth Proportional to 259.05, 386.00 and 231.80

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Solution

The fourth proportional to 259.05, 386.00 and 231.80 is: 345.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.05 : 386.00 = 231.80 : x
  2. Step 2: Convert to fraction form
    259.05/386.00 = 231.80/x
  3. Step 3: Cross multiply
    259.05x = 386.00 × 231.80
  4. Step 4: Simplify right side
    259.05x = 89,473.45
  5. Step 5: Solve for x
    x = 89,473.45/259.05
  6. Step 6: Final answer
    x = 345.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.