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Finding the Fourth Proportional to 127.45, 190.71 and 105.58

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Solution

The fourth proportional to 127.45, 190.71 and 105.58 is: 157.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.45 : 190.71 = 105.58 : x
  2. Step 2: Convert to fraction form
    127.45/190.71 = 105.58/x
  3. Step 3: Cross multiply
    127.45x = 190.71 × 105.58
  4. Step 4: Simplify right side
    127.45x = 20,135.16
  5. Step 5: Solve for x
    x = 20,135.16/127.45
  6. Step 6: Final answer
    x = 157.98

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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.