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Finding the Fourth Proportional to 137.31, 189.41 and 104.55

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Solution

The fourth proportional to 137.31, 189.41 and 104.55 is: 144.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.31 : 189.41 = 104.55 : x
  2. Step 2: Convert to fraction form
    137.31/189.41 = 104.55/x
  3. Step 3: Cross multiply
    137.31x = 189.41 × 104.55
  4. Step 4: Simplify right side
    137.31x = 19,802.29
  5. Step 5: Solve for x
    x = 19,802.29/137.31
  6. Step 6: Final answer
    x = 144.22

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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.