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Finding the Fourth Proportional to 119.34, 178.74 and 103.95

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Solution

The fourth proportional to 119.34, 178.74 and 103.95 is: 155.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.34 : 178.74 = 103.95 : x
  2. Step 2: Convert to fraction form
    119.34/178.74 = 103.95/x
  3. Step 3: Cross multiply
    119.34x = 178.74 × 103.95
  4. Step 4: Simplify right side
    119.34x = 18,580.02
  5. Step 5: Solve for x
    x = 18,580.02/119.34
  6. Step 6: Final answer
    x = 155.69

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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.