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Finding the Fourth Proportional to 128.28, 193.53 and 128.04

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Solution

The fourth proportional to 128.28, 193.53 and 128.04 is: 193.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.28 : 193.53 = 128.04 : x
  2. Step 2: Convert to fraction form
    128.28/193.53 = 128.04/x
  3. Step 3: Cross multiply
    128.28x = 193.53 × 128.04
  4. Step 4: Simplify right side
    128.28x = 24,779.58
  5. Step 5: Solve for x
    x = 24,779.58/128.28
  6. Step 6: Final answer
    x = 193.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.