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Finding the Fourth Proportional to 20,651.70, 28,499.46 and 12,699.12

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Solution

The fourth proportional to 20,651.70, 28,499.46 and 12,699.12 is: 17,524.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,651.70 : 28,499.46 = 12,699.12 : x
  2. Step 2: Convert to fraction form
    20,651.70/28,499.46 = 12,699.12/x
  3. Step 3: Cross multiply
    20,651.70x = 28,499.46 × 12,699.12
  4. Step 4: Simplify right side
    20,651.70x = 361,918,062.48
  5. Step 5: Solve for x
    x = 361,918,062.48/20,651.70
  6. Step 6: Final answer
    x = 17,524.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.