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Finding the Fourth Proportional to 20,419.80, 28,183.80 and 12,870.60

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Solution

The fourth proportional to 20,419.80, 28,183.80 and 12,870.60 is: 17,764.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.80 : 28,183.80 = 12,870.60 : x
  2. Step 2: Convert to fraction form
    20,419.80/28,183.80 = 12,870.60/x
  3. Step 3: Cross multiply
    20,419.80x = 28,183.80 × 12,870.60
  4. Step 4: Simplify right side
    20,419.80x = 362,742,416.28
  5. Step 5: Solve for x
    x = 362,742,416.28/20,419.80
  6. Step 6: Final answer
    x = 17,764.25

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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.