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Finding the Fourth Proportional to 128.32, 192.40 and 101.28

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Solution

The fourth proportional to 128.32, 192.40 and 101.28 is: 151.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.32 : 192.40 = 101.28 : x
  2. Step 2: Convert to fraction form
    128.32/192.40 = 101.28/x
  3. Step 3: Cross multiply
    128.32x = 192.40 × 101.28
  4. Step 4: Simplify right side
    128.32x = 19,486.27
  5. Step 5: Solve for x
    x = 19,486.27/128.32
  6. Step 6: Final answer
    x = 151.86

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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.