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Finding the Fourth Proportional to 137.33, 189.40 and 106.15

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Solution

The fourth proportional to 137.33, 189.40 and 106.15 is: 146.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.33 : 189.40 = 106.15 : x
  2. Step 2: Convert to fraction form
    137.33/189.40 = 106.15/x
  3. Step 3: Cross multiply
    137.33x = 189.40 × 106.15
  4. Step 4: Simplify right side
    137.33x = 20,104.81
  5. Step 5: Solve for x
    x = 20,104.81/137.33
  6. Step 6: Final answer
    x = 146.40

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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.