Home / 20,621.25-28,457.95-12,121.81

Finding the Fourth Proportional to 20,621.25, 28,457.95 and 12,121.81

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Solution

The fourth proportional to 20,621.25, 28,457.95 and 12,121.81 is: 16,728.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.25 : 28,457.95 = 12,121.81 : x
  2. Step 2: Convert to fraction form
    20,621.25/28,457.95 = 12,121.81/x
  3. Step 3: Cross multiply
    20,621.25x = 28,457.95 × 12,121.81
  4. Step 4: Simplify right side
    20,621.25x = 344,961,659.99
  5. Step 5: Solve for x
    x = 344,961,659.99/20,621.25
  6. Step 6: Final answer
    x = 16,728.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.