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Finding the Fourth Proportional to 130.96, 196.56 and 118.78

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Solution

The fourth proportional to 130.96, 196.56 and 118.78 is: 178.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.96 : 196.56 = 118.78 : x
  2. Step 2: Convert to fraction form
    130.96/196.56 = 118.78/x
  3. Step 3: Cross multiply
    130.96x = 196.56 × 118.78
  4. Step 4: Simplify right side
    130.96x = 23,347.40
  5. Step 5: Solve for x
    x = 23,347.40/130.96
  6. Step 6: Final answer
    x = 178.28

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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.