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Finding the Fourth Proportional to 388.56, 535.06 and 321.96

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Solution

The fourth proportional to 388.56, 535.06 and 321.96 is: 443.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.56 : 535.06 = 321.96 : x
  2. Step 2: Convert to fraction form
    388.56/535.06 = 321.96/x
  3. Step 3: Cross multiply
    388.56x = 535.06 × 321.96
  4. Step 4: Simplify right side
    388.56x = 172,267.92
  5. Step 5: Solve for x
    x = 172,267.92/388.56
  6. Step 6: Final answer
    x = 443.35

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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.