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Finding the Fourth Proportional to 8,485.71, 12,726.41 and 2,639.31

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Solution

The fourth proportional to 8,485.71, 12,726.41 and 2,639.31 is: 3,958.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,485.71 : 12,726.41 = 2,639.31 : x
  2. Step 2: Convert to fraction form
    8,485.71/12,726.41 = 2,639.31/x
  3. Step 3: Cross multiply
    8,485.71x = 12,726.41 × 2,639.31
  4. Step 4: Simplify right side
    8,485.71x = 33,588,927.98
  5. Step 5: Solve for x
    x = 33,588,927.98/8,485.71
  6. Step 6: Final answer
    x = 3,958.29

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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.