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Finding the Fourth Proportional to 3,890.66, 5,326.15 and 3,862.87

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Solution

The fourth proportional to 3,890.66, 5,326.15 and 3,862.87 is: 5,288.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.66 : 5,326.15 = 3,862.87 : x
  2. Step 2: Convert to fraction form
    3,890.66/5,326.15 = 3,862.87/x
  3. Step 3: Cross multiply
    3,890.66x = 5,326.15 × 3,862.87
  4. Step 4: Simplify right side
    3,890.66x = 20,574,179.11
  5. Step 5: Solve for x
    x = 20,574,179.11/3,890.66
  6. Step 6: Final answer
    x = 5,288.09

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.