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Finding the Fourth Proportional to 127.25, 175.59 and 74.78

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Solution

The fourth proportional to 127.25, 175.59 and 74.78 is: 103.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.25 : 175.59 = 74.78 : x
  2. Step 2: Convert to fraction form
    127.25/175.59 = 74.78/x
  3. Step 3: Cross multiply
    127.25x = 175.59 × 74.78
  4. Step 4: Simplify right side
    127.25x = 13,130.62
  5. Step 5: Solve for x
    x = 13,130.62/127.25
  6. Step 6: Final answer
    x = 103.19

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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.