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Finding the Fourth Proportional to 151.21, 225.50 and 139.87

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Solution

The fourth proportional to 151.21, 225.50 and 139.87 is: 208.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.21 : 225.50 = 139.87 : x
  2. Step 2: Convert to fraction form
    151.21/225.50 = 139.87/x
  3. Step 3: Cross multiply
    151.21x = 225.50 × 139.87
  4. Step 4: Simplify right side
    151.21x = 31,540.69
  5. Step 5: Solve for x
    x = 31,540.69/151.21
  6. Step 6: Final answer
    x = 208.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.