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Finding the Fourth Proportional to 127.41, 190.80 and 78.54

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Solution

The fourth proportional to 127.41, 190.80 and 78.54 is: 117.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.41 : 190.80 = 78.54 : x
  2. Step 2: Convert to fraction form
    127.41/190.80 = 78.54/x
  3. Step 3: Cross multiply
    127.41x = 190.80 × 78.54
  4. Step 4: Simplify right side
    127.41x = 14,985.43
  5. Step 5: Solve for x
    x = 14,985.43/127.41
  6. Step 6: Final answer
    x = 117.62

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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.