Home / 21,108.53-31,662.84-8,628.59

Finding the Fourth Proportional to 21,108.53, 31,662.84 and 8,628.59

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Solution

The fourth proportional to 21,108.53, 31,662.84 and 8,628.59 is: 12,942.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.53 : 31,662.84 = 8,628.59 : x
  2. Step 2: Convert to fraction form
    21,108.53/31,662.84 = 8,628.59/x
  3. Step 3: Cross multiply
    21,108.53x = 31,662.84 × 8,628.59
  4. Step 4: Simplify right side
    21,108.53x = 273,205,506.28
  5. Step 5: Solve for x
    x = 273,205,506.28/21,108.53
  6. Step 6: Final answer
    x = 12,942.90

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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.