Home / 21,103.94-31,655.31-8,620.43

Finding the Fourth Proportional to 21,103.94, 31,655.31 and 8,620.43

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Solution

The fourth proportional to 21,103.94, 31,655.31 and 8,620.43 is: 12,930.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,103.94 : 31,655.31 = 8,620.43 : x
  2. Step 2: Convert to fraction form
    21,103.94/31,655.31 = 8,620.43/x
  3. Step 3: Cross multiply
    21,103.94x = 31,655.31 × 8,620.43
  4. Step 4: Simplify right side
    21,103.94x = 272,882,193.38
  5. Step 5: Solve for x
    x = 272,882,193.38/21,103.94
  6. Step 6: Final answer
    x = 12,930.39

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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.