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Finding the Fourth Proportional to 172.35, 257.85 and 118.35

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Solution

The fourth proportional to 172.35, 257.85 and 118.35 is: 177.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.35 : 257.85 = 118.35 : x
  2. Step 2: Convert to fraction form
    172.35/257.85 = 118.35/x
  3. Step 3: Cross multiply
    172.35x = 257.85 × 118.35
  4. Step 4: Simplify right side
    172.35x = 30,516.55
  5. Step 5: Solve for x
    x = 30,516.55/172.35
  6. Step 6: Final answer
    x = 177.06

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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.