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Finding the Fourth Proportional to 20,211.70, 30,317.55 and 19,405.30

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Solution

The fourth proportional to 20,211.70, 30,317.55 and 19,405.30 is: 29,107.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,211.70 : 30,317.55 = 19,405.30 : x
  2. Step 2: Convert to fraction form
    20,211.70/30,317.55 = 19,405.30/x
  3. Step 3: Cross multiply
    20,211.70x = 30,317.55 × 19,405.30
  4. Step 4: Simplify right side
    20,211.70x = 588,321,153.02
  5. Step 5: Solve for x
    x = 588,321,153.02/20,211.70
  6. Step 6: Final answer
    x = 29,107.95

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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.