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Finding the Fourth Proportional to 1,913.81, 2,872.07 and 681.22

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Solution

The fourth proportional to 1,913.81, 2,872.07 and 681.22 is: 1,022.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.81 : 2,872.07 = 681.22 : x
  2. Step 2: Convert to fraction form
    1,913.81/2,872.07 = 681.22/x
  3. Step 3: Cross multiply
    1,913.81x = 2,872.07 × 681.22
  4. Step 4: Simplify right side
    1,913.81x = 1,956,511.53
  5. Step 5: Solve for x
    x = 1,956,511.53/1,913.81
  6. Step 6: Final answer
    x = 1,022.31

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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.