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Finding the Fourth Proportional to 642.43, 962.02 and 398.22

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Solution

The fourth proportional to 642.43, 962.02 and 398.22 is: 596.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.43 : 962.02 = 398.22 : x
  2. Step 2: Convert to fraction form
    642.43/962.02 = 398.22/x
  3. Step 3: Cross multiply
    642.43x = 962.02 × 398.22
  4. Step 4: Simplify right side
    642.43x = 383,095.60
  5. Step 5: Solve for x
    x = 383,095.60/642.43
  6. Step 6: Final answer
    x = 596.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.