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Finding the Fourth Proportional to 3,909.63, 5,862.29 and 1,311.87

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Solution

The fourth proportional to 3,909.63, 5,862.29 and 1,311.87 is: 1,967.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.63 : 5,862.29 = 1,311.87 : x
  2. Step 2: Convert to fraction form
    3,909.63/5,862.29 = 1,311.87/x
  3. Step 3: Cross multiply
    3,909.63x = 5,862.29 × 1,311.87
  4. Step 4: Simplify right side
    3,909.63x = 7,690,555.82
  5. Step 5: Solve for x
    x = 7,690,555.82/3,909.63
  6. Step 6: Final answer
    x = 1,967.08

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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.