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Finding the Fourth Proportional to 109.35, 150.66 and 103.28

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Solution

The fourth proportional to 109.35, 150.66 and 103.28 is: 142.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.35 : 150.66 = 103.28 : x
  2. Step 2: Convert to fraction form
    109.35/150.66 = 103.28/x
  3. Step 3: Cross multiply
    109.35x = 150.66 × 103.28
  4. Step 4: Simplify right side
    109.35x = 15,559.41
  5. Step 5: Solve for x
    x = 15,559.41/109.35
  6. Step 6: Final answer
    x = 142.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.