Home / 20,939.77-28,903.63-13,406.39

Finding the Fourth Proportional to 20,939.77, 28,903.63 and 13,406.39

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Solution

The fourth proportional to 20,939.77, 28,903.63 and 13,406.39 is: 18,505.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.77 : 28,903.63 = 13,406.39 : x
  2. Step 2: Convert to fraction form
    20,939.77/28,903.63 = 13,406.39/x
  3. Step 3: Cross multiply
    20,939.77x = 28,903.63 × 13,406.39
  4. Step 4: Simplify right side
    20,939.77x = 387,493,416.56
  5. Step 5: Solve for x
    x = 387,493,416.56/20,939.77
  6. Step 6: Final answer
    x = 18,505.14

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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.