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Finding the Fourth Proportional to 142.21, 196.59 and 127.63

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Solution

The fourth proportional to 142.21, 196.59 and 127.63 is: 176.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.21 : 196.59 = 127.63 : x
  2. Step 2: Convert to fraction form
    142.21/196.59 = 127.63/x
  3. Step 3: Cross multiply
    142.21x = 196.59 × 127.63
  4. Step 4: Simplify right side
    142.21x = 25,090.78
  5. Step 5: Solve for x
    x = 25,090.78/142.21
  6. Step 6: Final answer
    x = 176.43

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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.