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Finding the Fourth Proportional to 218.75, 328.12 and 103.12

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Solution

The fourth proportional to 218.75, 328.12 and 103.12 is: 154.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.75 : 328.12 = 103.12 : x
  2. Step 2: Convert to fraction form
    218.75/328.12 = 103.12/x
  3. Step 3: Cross multiply
    218.75x = 328.12 × 103.12
  4. Step 4: Simplify right side
    218.75x = 33,834.09
  5. Step 5: Solve for x
    x = 33,834.09/218.75
  6. Step 6: Final answer
    x = 154.67

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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.