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Finding the Fourth Proportional to 385.85, 532.38 and 217.76

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Solution

The fourth proportional to 385.85, 532.38 and 217.76 is: 300.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.85 : 532.38 = 217.76 : x
  2. Step 2: Convert to fraction form
    385.85/532.38 = 217.76/x
  3. Step 3: Cross multiply
    385.85x = 532.38 × 217.76
  4. Step 4: Simplify right side
    385.85x = 115,931.07
  5. Step 5: Solve for x
    x = 115,931.07/385.85
  6. Step 6: Final answer
    x = 300.46

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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.