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Finding the Fourth Proportional to 20,187.80, 30,269.70 and 12,402.20

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Solution

The fourth proportional to 20,187.80, 30,269.70 and 12,402.20 is: 18,595.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,187.80 : 30,269.70 = 12,402.20 : x
  2. Step 2: Convert to fraction form
    20,187.80/30,269.70 = 12,402.20/x
  3. Step 3: Cross multiply
    20,187.80x = 30,269.70 × 12,402.20
  4. Step 4: Simplify right side
    20,187.80x = 375,410,873.34
  5. Step 5: Solve for x
    x = 375,410,873.34/20,187.80
  6. Step 6: Final answer
    x = 18,595.93

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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.