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Finding the Fourth Proportional to 3,807.88, 5,712.42 and 1,211.40

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Solution

The fourth proportional to 3,807.88, 5,712.42 and 1,211.40 is: 1,817.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,807.88 : 5,712.42 = 1,211.40 : x
  2. Step 2: Convert to fraction form
    3,807.88/5,712.42 = 1,211.40/x
  3. Step 3: Cross multiply
    3,807.88x = 5,712.42 × 1,211.40
  4. Step 4: Simplify right side
    3,807.88x = 6,920,025.59
  5. Step 5: Solve for x
    x = 6,920,025.59/3,807.88
  6. Step 6: Final answer
    x = 1,817.29

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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.