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Finding the Fourth Proportional to 251.39, 376.93 and 105.21

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Solution

The fourth proportional to 251.39, 376.93 and 105.21 is: 157.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.39 : 376.93 = 105.21 : x
  2. Step 2: Convert to fraction form
    251.39/376.93 = 105.21/x
  3. Step 3: Cross multiply
    251.39x = 376.93 × 105.21
  4. Step 4: Simplify right side
    251.39x = 39,656.81
  5. Step 5: Solve for x
    x = 39,656.81/251.39
  6. Step 6: Final answer
    x = 157.75

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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.