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Finding the Fourth Proportional to 219.33, 328.89 and 75

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Solution

The fourth proportional to 219.33, 328.89 and 75 is: 112.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.33 : 328.89 = 75 : x
  2. Step 2: Convert to fraction form
    219.33/328.89 = 75/x
  3. Step 3: Cross multiply
    219.33x = 328.89 × 75
  4. Step 4: Simplify right side
    219.33x = 24,666.75
  5. Step 5: Solve for x
    x = 24,666.75/219.33
  6. Step 6: Final answer
    x = 112.46

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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.