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Finding the Fourth Proportional to 109, 150.40 and 76.20

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Solution

The fourth proportional to 109, 150.40 and 76.20 is: 105.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    109 : 150.40 = 76.20 : x
  2. Step 2: Convert to fraction form
    109/150.40 = 76.20/x
  3. Step 3: Cross multiply
    109x = 150.40 × 76.20
  4. Step 4: Simplify right side
    109x = 11,460.48
  5. Step 5: Solve for x
    x = 11,460.48/109
  6. Step 6: Final answer
    x = 105.14

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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.