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Finding the Fourth Proportional to 128.47, 192.44 and 106.76

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Solution

The fourth proportional to 128.47, 192.44 and 106.76 is: 159.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.47 : 192.44 = 106.76 : x
  2. Step 2: Convert to fraction form
    128.47/192.44 = 106.76/x
  3. Step 3: Cross multiply
    128.47x = 192.44 × 106.76
  4. Step 4: Simplify right side
    128.47x = 20,544.89
  5. Step 5: Solve for x
    x = 20,544.89/128.47
  6. Step 6: Final answer
    x = 159.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.