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Finding the Fourth Proportional to 20,999.70, 31,499.55 and 19,395.90

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Solution

The fourth proportional to 20,999.70, 31,499.55 and 19,395.90 is: 29,093.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.70 : 31,499.55 = 19,395.90 : x
  2. Step 2: Convert to fraction form
    20,999.70/31,499.55 = 19,395.90/x
  3. Step 3: Cross multiply
    20,999.70x = 31,499.55 × 19,395.90
  4. Step 4: Simplify right side
    20,999.70x = 610,962,121.85
  5. Step 5: Solve for x
    x = 610,962,121.85/20,999.70
  6. Step 6: Final answer
    x = 29,093.85

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1.5x scale

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.