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Finding the Fourth Proportional to 219.49, 328.99 and 89.56

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Solution

The fourth proportional to 219.49, 328.99 and 89.56 is: 134.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.49 : 328.99 = 89.56 : x
  2. Step 2: Convert to fraction form
    219.49/328.99 = 89.56/x
  3. Step 3: Cross multiply
    219.49x = 328.99 × 89.56
  4. Step 4: Simplify right side
    219.49x = 29,464.34
  5. Step 5: Solve for x
    x = 29,464.34/219.49
  6. Step 6: Final answer
    x = 134.24

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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.