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Finding the Fourth Proportional to 172.76, 258.48 and 113.98

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Solution

The fourth proportional to 172.76, 258.48 and 113.98 is: 170.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.76 : 258.48 = 113.98 : x
  2. Step 2: Convert to fraction form
    172.76/258.48 = 113.98/x
  3. Step 3: Cross multiply
    172.76x = 258.48 × 113.98
  4. Step 4: Simplify right side
    172.76x = 29,461.55
  5. Step 5: Solve for x
    x = 29,461.55/172.76
  6. Step 6: Final answer
    x = 170.53

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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.