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Finding the Fourth Proportional to 259.75, 358.47 and 143.31

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Solution

The fourth proportional to 259.75, 358.47 and 143.31 is: 197.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.75 : 358.47 = 143.31 : x
  2. Step 2: Convert to fraction form
    259.75/358.47 = 143.31/x
  3. Step 3: Cross multiply
    259.75x = 358.47 × 143.31
  4. Step 4: Simplify right side
    259.75x = 51,372.34
  5. Step 5: Solve for x
    x = 51,372.34/259.75
  6. Step 6: Final answer
    x = 197.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.