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Finding the Fourth Proportional to 128.34, 192.42 and 85.50

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Solution

The fourth proportional to 128.34, 192.42 and 85.50 is: 128.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.34 : 192.42 = 85.50 : x
  2. Step 2: Convert to fraction form
    128.34/192.42 = 85.50/x
  3. Step 3: Cross multiply
    128.34x = 192.42 × 85.50
  4. Step 4: Simplify right side
    128.34x = 16,451.91
  5. Step 5: Solve for x
    x = 16,451.91/128.34
  6. Step 6: Final answer
    x = 128.19

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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.