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Finding the Fourth Proportional to 387.88, 535.24 and 213.22

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Solution

The fourth proportional to 387.88, 535.24 and 213.22 is: 294.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.88 : 535.24 = 213.22 : x
  2. Step 2: Convert to fraction form
    387.88/535.24 = 213.22/x
  3. Step 3: Cross multiply
    387.88x = 535.24 × 213.22
  4. Step 4: Simplify right side
    387.88x = 114,123.87
  5. Step 5: Solve for x
    x = 114,123.87/387.88
  6. Step 6: Final answer
    x = 294.22

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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.