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Finding the Fourth Proportional to 20,329.85, 30,495 and 7,172.99

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Solution

The fourth proportional to 20,329.85, 30,495 and 7,172.99 is: 10,759.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,329.85 : 30,495 = 7,172.99 : x
  2. Step 2: Convert to fraction form
    20,329.85/30,495 = 7,172.99/x
  3. Step 3: Cross multiply
    20,329.85x = 30,495 × 7,172.99
  4. Step 4: Simplify right side
    20,329.85x = 218,740,177.58
  5. Step 5: Solve for x
    x = 218,740,177.58/20,329.85
  6. Step 6: Final answer
    x = 10,759.56

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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.