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Finding the Fourth Proportional to 127.44, 175.86 and 78.30

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Solution

The fourth proportional to 127.44, 175.86 and 78.30 is: 108.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.44 : 175.86 = 78.30 : x
  2. Step 2: Convert to fraction form
    127.44/175.86 = 78.30/x
  3. Step 3: Cross multiply
    127.44x = 175.86 × 78.30
  4. Step 4: Simplify right side
    127.44x = 13,769.84
  5. Step 5: Solve for x
    x = 13,769.84/127.44
  6. Step 6: Final answer
    x = 108.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.