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Finding the Fourth Proportional to 137.28, 189.47 and 84.83

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Solution

The fourth proportional to 137.28, 189.47 and 84.83 is: 117.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.28 : 189.47 = 84.83 : x
  2. Step 2: Convert to fraction form
    137.28/189.47 = 84.83/x
  3. Step 3: Cross multiply
    137.28x = 189.47 × 84.83
  4. Step 4: Simplify right side
    137.28x = 16,072.74
  5. Step 5: Solve for x
    x = 16,072.74/137.28
  6. Step 6: Final answer
    x = 117.08

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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.