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Finding the Fourth Proportional to 385.85, 532.51 and 220.12

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Solution

The fourth proportional to 385.85, 532.51 and 220.12 is: 303.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.85 : 532.51 = 220.12 : x
  2. Step 2: Convert to fraction form
    385.85/532.51 = 220.12/x
  3. Step 3: Cross multiply
    385.85x = 532.51 × 220.12
  4. Step 4: Simplify right side
    385.85x = 117,214.22
  5. Step 5: Solve for x
    x = 117,214.22/385.85
  6. Step 6: Final answer
    x = 303.78

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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.