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Finding the Fourth Proportional to 151.22, 226.36 and 86.90

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Solution

The fourth proportional to 151.22, 226.36 and 86.90 is: 130.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.22 : 226.36 = 86.90 : x
  2. Step 2: Convert to fraction form
    151.22/226.36 = 86.90/x
  3. Step 3: Cross multiply
    151.22x = 226.36 × 86.90
  4. Step 4: Simplify right side
    151.22x = 19,670.68
  5. Step 5: Solve for x
    x = 19,670.68/151.22
  6. Step 6: Final answer
    x = 130.08

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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.