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Finding the Fourth Proportional to 51,247.80, 76,890.90 and 20,105.40

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Solution

The fourth proportional to 51,247.80, 76,890.90 and 20,105.40 is: 30,165.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,247.80 : 76,890.90 = 20,105.40 : x
  2. Step 2: Convert to fraction form
    51,247.80/76,890.90 = 20,105.40/x
  3. Step 3: Cross multiply
    51,247.80x = 76,890.90 × 20,105.40
  4. Step 4: Simplify right side
    51,247.80x = 1,545,922,300.86
  5. Step 5: Solve for x
    x = 1,545,922,300.86/51,247.80
  6. Step 6: Final answer
    x = 30,165.63

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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.