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Finding the Fourth Proportional to 137.30, 189.43 and 84.13

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Solution

The fourth proportional to 137.30, 189.43 and 84.13 is: 116.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.30 : 189.43 = 84.13 : x
  2. Step 2: Convert to fraction form
    137.30/189.43 = 84.13/x
  3. Step 3: Cross multiply
    137.30x = 189.43 × 84.13
  4. Step 4: Simplify right side
    137.30x = 15,936.06
  5. Step 5: Solve for x
    x = 15,936.06/137.30
  6. Step 6: Final answer
    x = 116.07

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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.