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Finding the Fourth Proportional to 20,644.10, 30,929.70 and 18,311.30

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Solution

The fourth proportional to 20,644.10, 30,929.70 and 18,311.30 is: 27,434.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,644.10 : 30,929.70 = 18,311.30 : x
  2. Step 2: Convert to fraction form
    20,644.10/30,929.70 = 18,311.30/x
  3. Step 3: Cross multiply
    20,644.10x = 30,929.70 × 18,311.30
  4. Step 4: Simplify right side
    20,644.10x = 566,363,015.61
  5. Step 5: Solve for x
    x = 566,363,015.61/20,644.10
  6. Step 6: Final answer
    x = 27,434.62

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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.