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Finding the Fourth Proportional to 1,876.67, 2,815.01 and 644.43

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Solution

The fourth proportional to 1,876.67, 2,815.01 and 644.43 is: 966.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.67 : 2,815.01 = 644.43 : x
  2. Step 2: Convert to fraction form
    1,876.67/2,815.01 = 644.43/x
  3. Step 3: Cross multiply
    1,876.67x = 2,815.01 × 644.43
  4. Step 4: Simplify right side
    1,876.67x = 1,814,073.67
  5. Step 5: Solve for x
    x = 1,814,073.67/1,876.67
  6. Step 6: Final answer
    x = 966.65

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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.