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Finding the Fourth Proportional to 385.26, 531.66 and 219.47

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Solution

The fourth proportional to 385.26, 531.66 and 219.47 is: 302.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.26 : 531.66 = 219.47 : x
  2. Step 2: Convert to fraction form
    385.26/531.66 = 219.47/x
  3. Step 3: Cross multiply
    385.26x = 531.66 × 219.47
  4. Step 4: Simplify right side
    385.26x = 116,682.32
  5. Step 5: Solve for x
    x = 116,682.32/385.26
  6. Step 6: Final answer
    x = 302.87

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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.