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Finding the Fourth Proportional to 129.30, 192.79 and 127.70

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Solution

The fourth proportional to 129.30, 192.79 and 127.70 is: 190.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.30 : 192.79 = 127.70 : x
  2. Step 2: Convert to fraction form
    129.30/192.79 = 127.70/x
  3. Step 3: Cross multiply
    129.30x = 192.79 × 127.70
  4. Step 4: Simplify right side
    129.30x = 24,619.92
  5. Step 5: Solve for x
    x = 24,619.92/129.30
  6. Step 6: Final answer
    x = 190.41

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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.