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Finding the Fourth Proportional to 20,211.60, 30,259.80 and 12,435.60

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Solution

The fourth proportional to 20,211.60, 30,259.80 and 12,435.60 is: 18,617.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,211.60 : 30,259.80 = 12,435.60 : x
  2. Step 2: Convert to fraction form
    20,211.60/30,259.80 = 12,435.60/x
  3. Step 3: Cross multiply
    20,211.60x = 30,259.80 × 12,435.60
  4. Step 4: Simplify right side
    20,211.60x = 376,298,768.88
  5. Step 5: Solve for x
    x = 376,298,768.88/20,211.60
  6. Step 6: Final answer
    x = 18,617.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.