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Finding the Fourth Proportional to 127.81, 191.72 and 31.63

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Solution

The fourth proportional to 127.81, 191.72 and 31.63 is: 47.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.81 : 191.72 = 31.63 : x
  2. Step 2: Convert to fraction form
    127.81/191.72 = 31.63/x
  3. Step 3: Cross multiply
    127.81x = 191.72 × 31.63
  4. Step 4: Simplify right side
    127.81x = 6,063.22
  5. Step 5: Solve for x
    x = 6,063.22/127.81
  6. Step 6: Final answer
    x = 47.44

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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.