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Finding the Fourth Proportional to 172.28, 258.64 and 114.87

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Solution

The fourth proportional to 172.28, 258.64 and 114.87 is: 172.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.28 : 258.64 = 114.87 : x
  2. Step 2: Convert to fraction form
    172.28/258.64 = 114.87/x
  3. Step 3: Cross multiply
    172.28x = 258.64 × 114.87
  4. Step 4: Simplify right side
    172.28x = 29,709.85
  5. Step 5: Solve for x
    x = 29,709.85/172.28
  6. Step 6: Final answer
    x = 172.45

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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.