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Finding the Fourth Proportional to 149.47, 206.23 and 105.79

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Solution

The fourth proportional to 149.47, 206.23 and 105.79 is: 145.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.47 : 206.23 = 105.79 : x
  2. Step 2: Convert to fraction form
    149.47/206.23 = 105.79/x
  3. Step 3: Cross multiply
    149.47x = 206.23 × 105.79
  4. Step 4: Simplify right side
    149.47x = 21,817.07
  5. Step 5: Solve for x
    x = 21,817.07/149.47
  6. Step 6: Final answer
    x = 145.96

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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.