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Finding the Fourth Proportional to 641.66, 962.38 and 399.68

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Solution

The fourth proportional to 641.66, 962.38 and 399.68 is: 599.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.66 : 962.38 = 399.68 : x
  2. Step 2: Convert to fraction form
    641.66/962.38 = 399.68/x
  3. Step 3: Cross multiply
    641.66x = 962.38 × 399.68
  4. Step 4: Simplify right side
    641.66x = 384,644.04
  5. Step 5: Solve for x
    x = 384,644.04/641.66
  6. Step 6: Final answer
    x = 599.45

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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.