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Finding the Fourth Proportional to 1,843.61, 2,761.70 and 916.35

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Solution

The fourth proportional to 1,843.61, 2,761.70 and 916.35 is: 1,372.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,843.61 : 2,761.70 = 916.35 : x
  2. Step 2: Convert to fraction form
    1,843.61/2,761.70 = 916.35/x
  3. Step 3: Cross multiply
    1,843.61x = 2,761.70 × 916.35
  4. Step 4: Simplify right side
    1,843.61x = 2,530,679.21
  5. Step 5: Solve for x
    x = 2,530,679.21/1,843.61
  6. Step 6: Final answer
    x = 1,372.68

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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.