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Finding the Fourth Proportional to 219.34, 328.88 and 89.40

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Solution

The fourth proportional to 219.34, 328.88 and 89.40 is: 134.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.34 : 328.88 = 89.40 : x
  2. Step 2: Convert to fraction form
    219.34/328.88 = 89.40/x
  3. Step 3: Cross multiply
    219.34x = 328.88 × 89.40
  4. Step 4: Simplify right side
    219.34x = 29,401.87
  5. Step 5: Solve for x
    x = 29,401.87/219.34
  6. Step 6: Final answer
    x = 134.05

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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.