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Finding the Fourth Proportional to 173, 259.21 and 115.15

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Solution

The fourth proportional to 173, 259.21 and 115.15 is: 172.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    173 : 259.21 = 115.15 : x
  2. Step 2: Convert to fraction form
    173/259.21 = 115.15/x
  3. Step 3: Cross multiply
    173x = 259.21 × 115.15
  4. Step 4: Simplify right side
    173x = 29,848.03
  5. Step 5: Solve for x
    x = 29,848.03/173
  6. Step 6: Final answer
    x = 172.53

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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.