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Finding the Fourth Proportional to 151.42, 208.62 and 107.68

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Solution

The fourth proportional to 151.42, 208.62 and 107.68 is: 148.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.42 : 208.62 = 107.68 : x
  2. Step 2: Convert to fraction form
    151.42/208.62 = 107.68/x
  3. Step 3: Cross multiply
    151.42x = 208.62 × 107.68
  4. Step 4: Simplify right side
    151.42x = 22,464.20
  5. Step 5: Solve for x
    x = 22,464.20/151.42
  6. Step 6: Final answer
    x = 148.36

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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.