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Finding the Fourth Proportional to 172.71, 237.87 and 143.55

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Solution

The fourth proportional to 172.71, 237.87 and 143.55 is: 197.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.71 : 237.87 = 143.55 : x
  2. Step 2: Convert to fraction form
    172.71/237.87 = 143.55/x
  3. Step 3: Cross multiply
    172.71x = 237.87 × 143.55
  4. Step 4: Simplify right side
    172.71x = 34,146.24
  5. Step 5: Solve for x
    x = 34,146.24/172.71
  6. Step 6: Final answer
    x = 197.71

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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.