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Finding the Fourth Proportional to 219.47, 329.05 and 87.61

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Solution

The fourth proportional to 219.47, 329.05 and 87.61 is: 131.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.47 : 329.05 = 87.61 : x
  2. Step 2: Convert to fraction form
    219.47/329.05 = 87.61/x
  3. Step 3: Cross multiply
    219.47x = 329.05 × 87.61
  4. Step 4: Simplify right side
    219.47x = 28,826.43
  5. Step 5: Solve for x
    x = 28,826.43/219.47
  6. Step 6: Final answer
    x = 131.35

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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.