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Finding the Fourth Proportional to 129.04, 192.77 and 128.43

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Solution

The fourth proportional to 129.04, 192.77 and 128.43 is: 191.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.04 : 192.77 = 128.43 : x
  2. Step 2: Convert to fraction form
    129.04/192.77 = 128.43/x
  3. Step 3: Cross multiply
    129.04x = 192.77 × 128.43
  4. Step 4: Simplify right side
    129.04x = 24,757.77
  5. Step 5: Solve for x
    x = 24,757.77/129.04
  6. Step 6: Final answer
    x = 191.86

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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.