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Finding the Fourth Proportional to 387.08, 533.20 and 330.88

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Solution

The fourth proportional to 387.08, 533.20 and 330.88 is: 455.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.08 : 533.20 = 330.88 : x
  2. Step 2: Convert to fraction form
    387.08/533.20 = 330.88/x
  3. Step 3: Cross multiply
    387.08x = 533.20 × 330.88
  4. Step 4: Simplify right side
    387.08x = 176,425.22
  5. Step 5: Solve for x
    x = 176,425.22/387.08
  6. Step 6: Final answer
    x = 455.78

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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.