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Finding the Fourth Proportional to 128.28, 192.40 and 35.74

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Solution

The fourth proportional to 128.28, 192.40 and 35.74 is: 53.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.28 : 192.40 = 35.74 : x
  2. Step 2: Convert to fraction form
    128.28/192.40 = 35.74/x
  3. Step 3: Cross multiply
    128.28x = 192.40 × 35.74
  4. Step 4: Simplify right side
    128.28x = 6,876.24
  5. Step 5: Solve for x
    x = 6,876.24/128.28
  6. Step 6: Final answer
    x = 53.60

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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.