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Finding the Fourth Proportional to 172.38, 237.89 and 98.70

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Solution

The fourth proportional to 172.38, 237.89 and 98.70 is: 136.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.38 : 237.89 = 98.70 : x
  2. Step 2: Convert to fraction form
    172.38/237.89 = 98.70/x
  3. Step 3: Cross multiply
    172.38x = 237.89 × 98.70
  4. Step 4: Simplify right side
    172.38x = 23,479.15
  5. Step 5: Solve for x
    x = 23,479.15/172.38
  6. Step 6: Final answer
    x = 136.20

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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.