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Finding the Fourth Proportional to 385.66, 532.09 and 219.88

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Solution

The fourth proportional to 385.66, 532.09 and 219.88 is: 303.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.66 : 532.09 = 219.88 : x
  2. Step 2: Convert to fraction form
    385.66/532.09 = 219.88/x
  3. Step 3: Cross multiply
    385.66x = 532.09 × 219.88
  4. Step 4: Simplify right side
    385.66x = 116,994.85
  5. Step 5: Solve for x
    x = 116,994.85/385.66
  6. Step 6: Final answer
    x = 303.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.