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Finding the Fourth Proportional to 20,509.80, 30,755.70 and 9,412.80

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Solution

The fourth proportional to 20,509.80, 30,755.70 and 9,412.80 is: 14,115.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,509.80 : 30,755.70 = 9,412.80 : x
  2. Step 2: Convert to fraction form
    20,509.80/30,755.70 = 9,412.80/x
  3. Step 3: Cross multiply
    20,509.80x = 30,755.70 × 9,412.80
  4. Step 4: Simplify right side
    20,509.80x = 289,497,252.96
  5. Step 5: Solve for x
    x = 289,497,252.96/20,509.80
  6. Step 6: Final answer
    x = 14,115.07

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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.