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Finding the Fourth Proportional to 192.08, 288.30 and 128

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Solution

The fourth proportional to 192.08, 288.30 and 128 is: 192.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.08 : 288.30 = 128 : x
  2. Step 2: Convert to fraction form
    192.08/288.30 = 128/x
  3. Step 3: Cross multiply
    192.08x = 288.30 × 128
  4. Step 4: Simplify right side
    192.08x = 36,902.40
  5. Step 5: Solve for x
    x = 36,902.40/192.08
  6. Step 6: Final answer
    x = 192.12

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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.