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Finding the Fourth Proportional to 127.43, 189.76 and 119.64

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Solution

The fourth proportional to 127.43, 189.76 and 119.64 is: 178.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.43 : 189.76 = 119.64 : x
  2. Step 2: Convert to fraction form
    127.43/189.76 = 119.64/x
  3. Step 3: Cross multiply
    127.43x = 189.76 × 119.64
  4. Step 4: Simplify right side
    127.43x = 22,702.89
  5. Step 5: Solve for x
    x = 22,702.89/127.43
  6. Step 6: Final answer
    x = 178.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.