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Finding the Fourth Proportional to 259.22, 357.72 and 142.80

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Solution

The fourth proportional to 259.22, 357.72 and 142.80 is: 197.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.22 : 357.72 = 142.80 : x
  2. Step 2: Convert to fraction form
    259.22/357.72 = 142.80/x
  3. Step 3: Cross multiply
    259.22x = 357.72 × 142.80
  4. Step 4: Simplify right side
    259.22x = 51,082.42
  5. Step 5: Solve for x
    x = 51,082.42/259.22
  6. Step 6: Final answer
    x = 197.06

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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.