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Finding the Fourth Proportional to 127.78, 175.94 and 101.47

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Solution

The fourth proportional to 127.78, 175.94 and 101.47 is: 139.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.78 : 175.94 = 101.47 : x
  2. Step 2: Convert to fraction form
    127.78/175.94 = 101.47/x
  3. Step 3: Cross multiply
    127.78x = 175.94 × 101.47
  4. Step 4: Simplify right side
    127.78x = 17,852.63
  5. Step 5: Solve for x
    x = 17,852.63/127.78
  6. Step 6: Final answer
    x = 139.71

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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.