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Finding the Fourth Proportional to 1,876.81, 2,815.46 and 644.51

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Solution

The fourth proportional to 1,876.81, 2,815.46 and 644.51 is: 966.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.81 : 2,815.46 = 644.51 : x
  2. Step 2: Convert to fraction form
    1,876.81/2,815.46 = 644.51/x
  3. Step 3: Cross multiply
    1,876.81x = 2,815.46 × 644.51
  4. Step 4: Simplify right side
    1,876.81x = 1,814,592.12
  5. Step 5: Solve for x
    x = 1,814,592.12/1,876.81
  6. Step 6: Final answer
    x = 966.85

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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.