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Finding the Fourth Proportional to 199.56, 275.22 and 172.20

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Solution

The fourth proportional to 199.56, 275.22 and 172.20 is: 237.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.56 : 275.22 = 172.20 : x
  2. Step 2: Convert to fraction form
    199.56/275.22 = 172.20/x
  3. Step 3: Cross multiply
    199.56x = 275.22 × 172.20
  4. Step 4: Simplify right side
    199.56x = 47,392.88
  5. Step 5: Solve for x
    x = 47,392.88/199.56
  6. Step 6: Final answer
    x = 237.49

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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.