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Finding the Fourth Proportional to 107.28, 161.28 and 105.60

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Solution

The fourth proportional to 107.28, 161.28 and 105.60 is: 158.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.28 : 161.28 = 105.60 : x
  2. Step 2: Convert to fraction form
    107.28/161.28 = 105.60/x
  3. Step 3: Cross multiply
    107.28x = 161.28 × 105.60
  4. Step 4: Simplify right side
    107.28x = 17,031.17
  5. Step 5: Solve for x
    x = 17,031.17/107.28
  6. Step 6: Final answer
    x = 158.75

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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.