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Finding the Fourth Proportional to 137.80, 189.09 and 125.47

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Solution

The fourth proportional to 137.80, 189.09 and 125.47 is: 172.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.80 : 189.09 = 125.47 : x
  2. Step 2: Convert to fraction form
    137.80/189.09 = 125.47/x
  3. Step 3: Cross multiply
    137.80x = 189.09 × 125.47
  4. Step 4: Simplify right side
    137.80x = 23,725.12
  5. Step 5: Solve for x
    x = 23,725.12/137.80
  6. Step 6: Final answer
    x = 172.17

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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.