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Finding the Fourth Proportional to 127.19, 190.78 and 31

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Solution

The fourth proportional to 127.19, 190.78 and 31 is: 46.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.19 : 190.78 = 31 : x
  2. Step 2: Convert to fraction form
    127.19/190.78 = 31/x
  3. Step 3: Cross multiply
    127.19x = 190.78 × 31
  4. Step 4: Simplify right side
    127.19x = 5,914.26
  5. Step 5: Solve for x
    x = 5,914.26/127.19
  6. Step 6: Final answer
    x = 46.50

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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.