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Finding the Fourth Proportional to 462.78, 638.39 and 330.21

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Solution

The fourth proportional to 462.78, 638.39 and 330.21 is: 455.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.78 : 638.39 = 330.21 : x
  2. Step 2: Convert to fraction form
    462.78/638.39 = 330.21/x
  3. Step 3: Cross multiply
    462.78x = 638.39 × 330.21
  4. Step 4: Simplify right side
    462.78x = 210,803.59
  5. Step 5: Solve for x
    x = 210,803.59/462.78
  6. Step 6: Final answer
    x = 455.52

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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.