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Finding the Fourth Proportional to 146.70, 219.90 and 78.09

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Solution

The fourth proportional to 146.70, 219.90 and 78.09 is: 117.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.70 : 219.90 = 78.09 : x
  2. Step 2: Convert to fraction form
    146.70/219.90 = 78.09/x
  3. Step 3: Cross multiply
    146.70x = 219.90 × 78.09
  4. Step 4: Simplify right side
    146.70x = 17,171.99
  5. Step 5: Solve for x
    x = 17,171.99/146.70
  6. Step 6: Final answer
    x = 117.06

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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.