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Finding the Fourth Proportional to 1,917.79, 2,874.28 and 820.87

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Solution

The fourth proportional to 1,917.79, 2,874.28 and 820.87 is: 1,230.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.79 : 2,874.28 = 820.87 : x
  2. Step 2: Convert to fraction form
    1,917.79/2,874.28 = 820.87/x
  3. Step 3: Cross multiply
    1,917.79x = 2,874.28 × 820.87
  4. Step 4: Simplify right side
    1,917.79x = 2,359,410.22
  5. Step 5: Solve for x
    x = 2,359,410.22/1,917.79
  6. Step 6: Final answer
    x = 1,230.28

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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.