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Finding the Fourth Proportional to 385.55, 532.16 and 219.87

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Solution

The fourth proportional to 385.55, 532.16 and 219.87 is: 303.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.55 : 532.16 = 219.87 : x
  2. Step 2: Convert to fraction form
    385.55/532.16 = 219.87/x
  3. Step 3: Cross multiply
    385.55x = 532.16 × 219.87
  4. Step 4: Simplify right side
    385.55x = 117,006.02
  5. Step 5: Solve for x
    x = 117,006.02/385.55
  6. Step 6: Final answer
    x = 303.48

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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.