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Finding the Fourth Proportional to 20,178.60, 30,267.90 and 12,391.80

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Solution

The fourth proportional to 20,178.60, 30,267.90 and 12,391.80 is: 18,587.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,178.60 : 30,267.90 = 12,391.80 : x
  2. Step 2: Convert to fraction form
    20,178.60/30,267.90 = 12,391.80/x
  3. Step 3: Cross multiply
    20,178.60x = 30,267.90 × 12,391.80
  4. Step 4: Simplify right side
    20,178.60x = 375,073,763.22
  5. Step 5: Solve for x
    x = 375,073,763.22/20,178.60
  6. Step 6: Final answer
    x = 18,587.70

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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.