Home / 20,399.28-28,158.03-12,858.32

Finding the Fourth Proportional to 20,399.28, 28,158.03 and 12,858.32

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Solution

The fourth proportional to 20,399.28, 28,158.03 and 12,858.32 is: 17,748.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,399.28 : 28,158.03 = 12,858.32 : x
  2. Step 2: Convert to fraction form
    20,399.28/28,158.03 = 12,858.32/x
  3. Step 3: Cross multiply
    20,399.28x = 28,158.03 × 12,858.32
  4. Step 4: Simplify right side
    20,399.28x = 362,064,819.52
  5. Step 5: Solve for x
    x = 362,064,819.52/20,399.28
  6. Step 6: Final answer
    x = 17,748.90

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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.