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Finding the Fourth Proportional to 172.21, 258.36 and 76.05

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Solution

The fourth proportional to 172.21, 258.36 and 76.05 is: 114.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.21 : 258.36 = 76.05 : x
  2. Step 2: Convert to fraction form
    172.21/258.36 = 76.05/x
  3. Step 3: Cross multiply
    172.21x = 258.36 × 76.05
  4. Step 4: Simplify right side
    172.21x = 19,646.61
  5. Step 5: Solve for x
    x = 19,646.61/172.21
  6. Step 6: Final answer
    x = 114.09

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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.