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Finding the Fourth Proportional to 172.37, 237.89 and 98.72

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Solution

The fourth proportional to 172.37, 237.89 and 98.72 is: 136.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.37 : 237.89 = 98.72 : x
  2. Step 2: Convert to fraction form
    172.37/237.89 = 98.72/x
  3. Step 3: Cross multiply
    172.37x = 237.89 × 98.72
  4. Step 4: Simplify right side
    172.37x = 23,484.45
  5. Step 5: Solve for x
    x = 23,484.45/172.37
  6. Step 6: Final answer
    x = 136.24

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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.