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Finding the Fourth Proportional to 137.81, 206.18 and 99.37

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Solution

The fourth proportional to 137.81, 206.18 and 99.37 is: 148.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.81 : 206.18 = 99.37 : x
  2. Step 2: Convert to fraction form
    137.81/206.18 = 99.37/x
  3. Step 3: Cross multiply
    137.81x = 206.18 × 99.37
  4. Step 4: Simplify right side
    137.81x = 20,486.58
  5. Step 5: Solve for x
    x = 20,486.58/137.81
  6. Step 6: Final answer
    x = 148.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.