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Finding the Fourth Proportional to 149.03, 205.72 and 105.42

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Solution

The fourth proportional to 149.03, 205.72 and 105.42 is: 145.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.03 : 205.72 = 105.42 : x
  2. Step 2: Convert to fraction form
    149.03/205.72 = 105.42/x
  3. Step 3: Cross multiply
    149.03x = 205.72 × 105.42
  4. Step 4: Simplify right side
    149.03x = 21,686.74
  5. Step 5: Solve for x
    x = 21,686.74/149.03
  6. Step 6: Final answer
    x = 145.52

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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.