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Finding the Fourth Proportional to 641.34, 962.64 and 381.60

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Solution

The fourth proportional to 641.34, 962.64 and 381.60 is: 572.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.34 : 962.64 = 381.60 : x
  2. Step 2: Convert to fraction form
    641.34/962.64 = 381.60/x
  3. Step 3: Cross multiply
    641.34x = 962.64 × 381.60
  4. Step 4: Simplify right side
    641.34x = 367,343.42
  5. Step 5: Solve for x
    x = 367,343.42/641.34
  6. Step 6: Final answer
    x = 572.77

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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.