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Finding the Fourth Proportional to 388.34, 535.86 and 213.65

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Solution

The fourth proportional to 388.34, 535.86 and 213.65 is: 294.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.34 : 535.86 = 213.65 : x
  2. Step 2: Convert to fraction form
    388.34/535.86 = 213.65/x
  3. Step 3: Cross multiply
    388.34x = 535.86 × 213.65
  4. Step 4: Simplify right side
    388.34x = 114,483.81
  5. Step 5: Solve for x
    x = 114,483.81/388.34
  6. Step 6: Final answer
    x = 294.81

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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.