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Finding the Fourth Proportional to 465.44, 642 and 382.40

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Solution

The fourth proportional to 465.44, 642 and 382.40 is: 527.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.44 : 642 = 382.40 : x
  2. Step 2: Convert to fraction form
    465.44/642 = 382.40/x
  3. Step 3: Cross multiply
    465.44x = 642 × 382.40
  4. Step 4: Simplify right side
    465.44x = 245,500.80
  5. Step 5: Solve for x
    x = 245,500.80/465.44
  6. Step 6: Final answer
    x = 527.46

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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.