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Finding the Fourth Proportional to 642.10, 963.45 and 276.99

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Solution

The fourth proportional to 642.10, 963.45 and 276.99 is: 415.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.10 : 963.45 = 276.99 : x
  2. Step 2: Convert to fraction form
    642.10/963.45 = 276.99/x
  3. Step 3: Cross multiply
    642.10x = 963.45 × 276.99
  4. Step 4: Simplify right side
    642.10x = 266,866.02
  5. Step 5: Solve for x
    x = 266,866.02/642.10
  6. Step 6: Final answer
    x = 415.61

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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.