Home / 20,438.39-28,205.81-11,485.87

Finding the Fourth Proportional to 20,438.39, 28,205.81 and 11,485.87

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Solution

The fourth proportional to 20,438.39, 28,205.81 and 11,485.87 is: 15,850.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,438.39 : 28,205.81 = 11,485.87 : x
  2. Step 2: Convert to fraction form
    20,438.39/28,205.81 = 11,485.87/x
  3. Step 3: Cross multiply
    20,438.39x = 28,205.81 × 11,485.87
  4. Step 4: Simplify right side
    20,438.39x = 323,968,266.90
  5. Step 5: Solve for x
    x = 323,968,266.90/20,438.39
  6. Step 6: Final answer
    x = 15,850.97

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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.