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Finding the Fourth Proportional to 172.30, 237.70 and 105.90

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Solution

The fourth proportional to 172.30, 237.70 and 105.90 is: 146.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.30 : 237.70 = 105.90 : x
  2. Step 2: Convert to fraction form
    172.30/237.70 = 105.90/x
  3. Step 3: Cross multiply
    172.30x = 237.70 × 105.90
  4. Step 4: Simplify right side
    172.30x = 25,172.43
  5. Step 5: Solve for x
    x = 25,172.43/172.30
  6. Step 6: Final answer
    x = 146.10

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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.