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Finding the Fourth Proportional to 20,622, 28,458.41 and 11,190.57

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Solution

The fourth proportional to 20,622, 28,458.41 and 11,190.57 is: 15,443.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,622 : 28,458.41 = 11,190.57 : x
  2. Step 2: Convert to fraction form
    20,622/28,458.41 = 11,190.57/x
  3. Step 3: Cross multiply
    20,622x = 28,458.41 × 11,190.57
  4. Step 4: Simplify right side
    20,622x = 318,465,829.19
  5. Step 5: Solve for x
    x = 318,465,829.19/20,622
  6. Step 6: Final answer
    x = 15,443.01

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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.