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Finding the Fourth Proportional to 20,156.60, 30,234.90 and 12,369.80

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Solution

The fourth proportional to 20,156.60, 30,234.90 and 12,369.80 is: 18,554.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,156.60 : 30,234.90 = 12,369.80 : x
  2. Step 2: Convert to fraction form
    20,156.60/30,234.90 = 12,369.80/x
  3. Step 3: Cross multiply
    20,156.60x = 30,234.90 × 12,369.80
  4. Step 4: Simplify right side
    20,156.60x = 373,999,666.02
  5. Step 5: Solve for x
    x = 373,999,666.02/20,156.60
  6. Step 6: Final answer
    x = 18,554.70

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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.