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Finding the Fourth Proportional to 642.20, 962.50 and 276.68

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Solution

The fourth proportional to 642.20, 962.50 and 276.68 is: 414.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.20 : 962.50 = 276.68 : x
  2. Step 2: Convert to fraction form
    642.20/962.50 = 276.68/x
  3. Step 3: Cross multiply
    642.20x = 962.50 × 276.68
  4. Step 4: Simplify right side
    642.20x = 266,304.50
  5. Step 5: Solve for x
    x = 266,304.50/642.20
  6. Step 6: Final answer
    x = 414.68

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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.