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Finding the Fourth Proportional to 157.88, 217.78 and 105.39

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Solution

The fourth proportional to 157.88, 217.78 and 105.39 is: 145.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.88 : 217.78 = 105.39 : x
  2. Step 2: Convert to fraction form
    157.88/217.78 = 105.39/x
  3. Step 3: Cross multiply
    157.88x = 217.78 × 105.39
  4. Step 4: Simplify right side
    157.88x = 22,951.57
  5. Step 5: Solve for x
    x = 22,951.57/157.88
  6. Step 6: Final answer
    x = 145.37

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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.