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Finding the Fourth Proportional to 127.17, 190.67 and 78.44

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Solution

The fourth proportional to 127.17, 190.67 and 78.44 is: 117.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.17 : 190.67 = 78.44 : x
  2. Step 2: Convert to fraction form
    127.17/190.67 = 78.44/x
  3. Step 3: Cross multiply
    127.17x = 190.67 × 78.44
  4. Step 4: Simplify right side
    127.17x = 14,955.25
  5. Step 5: Solve for x
    x = 14,955.25/127.17
  6. Step 6: Final answer
    x = 117.60

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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.