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Finding the Fourth Proportional to 118.53, 178.20 and 78.03

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Solution

The fourth proportional to 118.53, 178.20 and 78.03 is: 117.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.53 : 178.20 = 78.03 : x
  2. Step 2: Convert to fraction form
    118.53/178.20 = 78.03/x
  3. Step 3: Cross multiply
    118.53x = 178.20 × 78.03
  4. Step 4: Simplify right side
    118.53x = 13,904.95
  5. Step 5: Solve for x
    x = 13,904.95/118.53
  6. Step 6: Final answer
    x = 117.31

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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.