Home / 20,815.60-31,223.40-19,211.80

Finding the Fourth Proportional to 20,815.60, 31,223.40 and 19,211.80

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Solution

The fourth proportional to 20,815.60, 31,223.40 and 19,211.80 is: 28,817.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.60 : 31,223.40 = 19,211.80 : x
  2. Step 2: Convert to fraction form
    20,815.60/31,223.40 = 19,211.80/x
  3. Step 3: Cross multiply
    20,815.60x = 31,223.40 × 19,211.80
  4. Step 4: Simplify right side
    20,815.60x = 599,857,716.12
  5. Step 5: Solve for x
    x = 599,857,716.12/20,815.60
  6. Step 6: Final answer
    x = 28,817.70

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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.