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Finding the Fourth Proportional to 1,961.21, 2,941.85 and 865.34

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Solution

The fourth proportional to 1,961.21, 2,941.85 and 865.34 is: 1,298.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.21 : 2,941.85 = 865.34 : x
  2. Step 2: Convert to fraction form
    1,961.21/2,941.85 = 865.34/x
  3. Step 3: Cross multiply
    1,961.21x = 2,941.85 × 865.34
  4. Step 4: Simplify right side
    1,961.21x = 2,545,700.48
  5. Step 5: Solve for x
    x = 2,545,700.48/1,961.21
  6. Step 6: Final answer
    x = 1,298.03

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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.