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Finding the Fourth Proportional to 119.10, 178.56 and 103.80

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Solution

The fourth proportional to 119.10, 178.56 and 103.80 is: 155.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.10 : 178.56 = 103.80 : x
  2. Step 2: Convert to fraction form
    119.10/178.56 = 103.80/x
  3. Step 3: Cross multiply
    119.10x = 178.56 × 103.80
  4. Step 4: Simplify right side
    119.10x = 18,534.53
  5. Step 5: Solve for x
    x = 18,534.53/119.10
  6. Step 6: Final answer
    x = 155.62

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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.