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Finding the Fourth Proportional to 138.98, 190.90 and 125.36

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Solution

The fourth proportional to 138.98, 190.90 and 125.36 is: 172.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.98 : 190.90 = 125.36 : x
  2. Step 2: Convert to fraction form
    138.98/190.90 = 125.36/x
  3. Step 3: Cross multiply
    138.98x = 190.90 × 125.36
  4. Step 4: Simplify right side
    138.98x = 23,931.22
  5. Step 5: Solve for x
    x = 23,931.22/138.98
  6. Step 6: Final answer
    x = 172.19

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.