Home / 20,491.68-30,720.24-8,172.96

Finding the Fourth Proportional to 20,491.68, 30,720.24 and 8,172.96

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Solution

The fourth proportional to 20,491.68, 30,720.24 and 8,172.96 is: 12,252.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.68 : 30,720.24 = 8,172.96 : x
  2. Step 2: Convert to fraction form
    20,491.68/30,720.24 = 8,172.96/x
  3. Step 3: Cross multiply
    20,491.68x = 30,720.24 × 8,172.96
  4. Step 4: Simplify right side
    20,491.68x = 251,075,292.71
  5. Step 5: Solve for x
    x = 251,075,292.71/20,491.68
  6. Step 6: Final answer
    x = 12,252.55

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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.