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Finding the Fourth Proportional to 20,406.58, 28,163.84 and 11,454.58

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Solution

The fourth proportional to 20,406.58, 28,163.84 and 11,454.58 is: 15,808.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,406.58 : 28,163.84 = 11,454.58 : x
  2. Step 2: Convert to fraction form
    20,406.58/28,163.84 = 11,454.58/x
  3. Step 3: Cross multiply
    20,406.58x = 28,163.84 × 11,454.58
  4. Step 4: Simplify right side
    20,406.58x = 322,604,958.39
  5. Step 5: Solve for x
    x = 322,604,958.39/20,406.58
  6. Step 6: Final answer
    x = 15,808.87

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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.