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Finding the Fourth Proportional to 172.55, 238.04 and 117.20

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Solution

The fourth proportional to 172.55, 238.04 and 117.20 is: 161.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.55 : 238.04 = 117.20 : x
  2. Step 2: Convert to fraction form
    172.55/238.04 = 117.20/x
  3. Step 3: Cross multiply
    172.55x = 238.04 × 117.20
  4. Step 4: Simplify right side
    172.55x = 27,898.74
  5. Step 5: Solve for x
    x = 27,898.74/172.55
  6. Step 6: Final answer
    x = 161.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.