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Finding the Fourth Proportional to 172.80, 238.36 and 103.80

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Solution

The fourth proportional to 172.80, 238.36 and 103.80 is: 143.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.80 : 238.36 = 103.80 : x
  2. Step 2: Convert to fraction form
    172.80/238.36 = 103.80/x
  3. Step 3: Cross multiply
    172.80x = 238.36 × 103.80
  4. Step 4: Simplify right side
    172.80x = 24,741.77
  5. Step 5: Solve for x
    x = 24,741.77/172.80
  6. Step 6: Final answer
    x = 143.18

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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.