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Finding the Fourth Proportional to 388.05, 535.52 and 213.40

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Solution

The fourth proportional to 388.05, 535.52 and 213.40 is: 294.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.05 : 535.52 = 213.40 : x
  2. Step 2: Convert to fraction form
    388.05/535.52 = 213.40/x
  3. Step 3: Cross multiply
    388.05x = 535.52 × 213.40
  4. Step 4: Simplify right side
    388.05x = 114,279.97
  5. Step 5: Solve for x
    x = 114,279.97/388.05
  6. Step 6: Final answer
    x = 294.50

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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.