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Finding the Fourth Proportional to 138.02, 189.51 and 134.45

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Solution

The fourth proportional to 138.02, 189.51 and 134.45 is: 184.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.02 : 189.51 = 134.45 : x
  2. Step 2: Convert to fraction form
    138.02/189.51 = 134.45/x
  3. Step 3: Cross multiply
    138.02x = 189.51 × 134.45
  4. Step 4: Simplify right side
    138.02x = 25,479.62
  5. Step 5: Solve for x
    x = 25,479.62/138.02
  6. Step 6: Final answer
    x = 184.61

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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.