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Finding the Fourth Proportional to 20,503.60, 28,284.60 and 15,786.16

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Solution

The fourth proportional to 20,503.60, 28,284.60 and 15,786.16 is: 21,776.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,503.60 : 28,284.60 = 15,786.16 : x
  2. Step 2: Convert to fraction form
    20,503.60/28,284.60 = 15,786.16/x
  3. Step 3: Cross multiply
    20,503.60x = 28,284.60 × 15,786.16
  4. Step 4: Simplify right side
    20,503.60x = 446,505,221.14
  5. Step 5: Solve for x
    x = 446,505,221.14/20,503.60
  6. Step 6: Final answer
    x = 21,776.92

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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.