Home / 20,785.68-28,684.80-12,407.04

Finding the Fourth Proportional to 20,785.68, 28,684.80 and 12,407.04

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Solution

The fourth proportional to 20,785.68, 28,684.80 and 12,407.04 is: 17,122.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,785.68 : 28,684.80 = 12,407.04 : x
  2. Step 2: Convert to fraction form
    20,785.68/28,684.80 = 12,407.04/x
  3. Step 3: Cross multiply
    20,785.68x = 28,684.80 × 12,407.04
  4. Step 4: Simplify right side
    20,785.68x = 355,893,460.99
  5. Step 5: Solve for x
    x = 355,893,460.99/20,785.68
  6. Step 6: Final answer
    x = 17,122.05

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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.