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Finding the Fourth Proportional to 130.14, 179.28 and 120.78

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Solution

The fourth proportional to 130.14, 179.28 and 120.78 is: 166.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.14 : 179.28 = 120.78 : x
  2. Step 2: Convert to fraction form
    130.14/179.28 = 120.78/x
  3. Step 3: Cross multiply
    130.14x = 179.28 × 120.78
  4. Step 4: Simplify right side
    130.14x = 21,653.44
  5. Step 5: Solve for x
    x = 21,653.44/130.14
  6. Step 6: Final answer
    x = 166.39

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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.