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Finding the Fourth Proportional to 20,999.80, 31,499.70 and 15,815.80

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Solution

The fourth proportional to 20,999.80, 31,499.70 and 15,815.80 is: 23,723.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.80 : 31,499.70 = 15,815.80 : x
  2. Step 2: Convert to fraction form
    20,999.80/31,499.70 = 15,815.80/x
  3. Step 3: Cross multiply
    20,999.80x = 31,499.70 × 15,815.80
  4. Step 4: Simplify right side
    20,999.80x = 498,192,955.26
  5. Step 5: Solve for x
    x = 498,192,955.26/20,999.80
  6. Step 6: Final answer
    x = 23,723.70

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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.