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Finding the Fourth Proportional to 222.58, 333.78 and 78.25

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Solution

The fourth proportional to 222.58, 333.78 and 78.25 is: 117.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.58 : 333.78 = 78.25 : x
  2. Step 2: Convert to fraction form
    222.58/333.78 = 78.25/x
  3. Step 3: Cross multiply
    222.58x = 333.78 × 78.25
  4. Step 4: Simplify right side
    222.58x = 26,118.29
  5. Step 5: Solve for x
    x = 26,118.29/222.58
  6. Step 6: Final answer
    x = 117.34

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.