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Finding the Fourth Proportional to 259.28, 357.81 and 142.85

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Solution

The fourth proportional to 259.28, 357.81 and 142.85 is: 197.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.28 : 357.81 = 142.85 : x
  2. Step 2: Convert to fraction form
    259.28/357.81 = 142.85/x
  3. Step 3: Cross multiply
    259.28x = 357.81 × 142.85
  4. Step 4: Simplify right side
    259.28x = 51,111.01
  5. Step 5: Solve for x
    x = 51,111.01/259.28
  6. Step 6: Final answer
    x = 197.12

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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.