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Finding the Fourth Proportional to 1,916.70, 2,874.43 and 820.77

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Solution

The fourth proportional to 1,916.70, 2,874.43 and 820.77 is: 1,230.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.70 : 2,874.43 = 820.77 : x
  2. Step 2: Convert to fraction form
    1,916.70/2,874.43 = 820.77/x
  3. Step 3: Cross multiply
    1,916.70x = 2,874.43 × 820.77
  4. Step 4: Simplify right side
    1,916.70x = 2,359,245.91
  5. Step 5: Solve for x
    x = 2,359,245.91/1,916.70
  6. Step 6: Final answer
    x = 1,230.89

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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.