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Finding the Fourth Proportional to 127.10, 175.64 and 102.80

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Solution

The fourth proportional to 127.10, 175.64 and 102.80 is: 142.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.10 : 175.64 = 102.80 : x
  2. Step 2: Convert to fraction form
    127.10/175.64 = 102.80/x
  3. Step 3: Cross multiply
    127.10x = 175.64 × 102.80
  4. Step 4: Simplify right side
    127.10x = 18,055.72
  5. Step 5: Solve for x
    x = 18,055.72/127.10
  6. Step 6: Final answer
    x = 142.06

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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.