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Finding the Fourth Proportional to 128.37, 192.58 and 63.38

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Solution

The fourth proportional to 128.37, 192.58 and 63.38 is: 95.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.37 : 192.58 = 63.38 : x
  2. Step 2: Convert to fraction form
    128.37/192.58 = 63.38/x
  3. Step 3: Cross multiply
    128.37x = 192.58 × 63.38
  4. Step 4: Simplify right side
    128.37x = 12,205.72
  5. Step 5: Solve for x
    x = 12,205.72/128.37
  6. Step 6: Final answer
    x = 95.08

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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.