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Finding the Fourth Proportional to 128.16, 192.10 and 55

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Solution

The fourth proportional to 128.16, 192.10 and 55 is: 82.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.16 : 192.10 = 55 : x
  2. Step 2: Convert to fraction form
    128.16/192.10 = 55/x
  3. Step 3: Cross multiply
    128.16x = 192.10 × 55
  4. Step 4: Simplify right side
    128.16x = 10,565.50
  5. Step 5: Solve for x
    x = 10,565.50/128.16
  6. Step 6: Final answer
    x = 82.44

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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.