Home / 20,918.20-28,892.85-15,636.60

Finding the Fourth Proportional to 20,918.20, 28,892.85 and 15,636.60

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Solution

The fourth proportional to 20,918.20, 28,892.85 and 15,636.60 is: 21,597.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.20 : 28,892.85 = 15,636.60 : x
  2. Step 2: Convert to fraction form
    20,918.20/28,892.85 = 15,636.60/x
  3. Step 3: Cross multiply
    20,918.20x = 28,892.85 × 15,636.60
  4. Step 4: Simplify right side
    20,918.20x = 451,785,938.31
  5. Step 5: Solve for x
    x = 451,785,938.31/20,918.20
  6. Step 6: Final answer
    x = 21,597.74

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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.