Home / 21,271.26-31,906.10-8,620.58

Finding the Fourth Proportional to 21,271.26, 31,906.10 and 8,620.58

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Solution

The fourth proportional to 21,271.26, 31,906.10 and 8,620.58 is: 12,930.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,271.26 : 31,906.10 = 8,620.58 : x
  2. Step 2: Convert to fraction form
    21,271.26/31,906.10 = 8,620.58/x
  3. Step 3: Cross multiply
    21,271.26x = 31,906.10 × 8,620.58
  4. Step 4: Simplify right side
    21,271.26x = 275,049,009.38
  5. Step 5: Solve for x
    x = 275,049,009.38/21,271.26
  6. Step 6: Final answer
    x = 12,930.55

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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.