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Finding the Fourth Proportional to 149, 205.62 and 103

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Solution

The fourth proportional to 149, 205.62 and 103 is: 142.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    149 : 205.62 = 103 : x
  2. Step 2: Convert to fraction form
    149/205.62 = 103/x
  3. Step 3: Cross multiply
    149x = 205.62 × 103
  4. Step 4: Simplify right side
    149x = 21,178.86
  5. Step 5: Solve for x
    x = 21,178.86/149
  6. Step 6: Final answer
    x = 142.14

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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.