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Finding the Fourth Proportional to 641.43, 962.58 and 398.09

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Solution

The fourth proportional to 641.43, 962.58 and 398.09 is: 597.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.43 : 962.58 = 398.09 : x
  2. Step 2: Convert to fraction form
    641.43/962.58 = 398.09/x
  3. Step 3: Cross multiply
    641.43x = 962.58 × 398.09
  4. Step 4: Simplify right side
    641.43x = 383,188.66
  5. Step 5: Solve for x
    x = 383,188.66/641.43
  6. Step 6: Final answer
    x = 597.40

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1.5x scale

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.