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Finding the Fourth Proportional to 20,668.70, 28,528.87 and 13,499.71

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Solution

The fourth proportional to 20,668.70, 28,528.87 and 13,499.71 is: 18,633.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,668.70 : 28,528.87 = 13,499.71 : x
  2. Step 2: Convert to fraction form
    20,668.70/28,528.87 = 13,499.71/x
  3. Step 3: Cross multiply
    20,668.70x = 28,528.87 × 13,499.71
  4. Step 4: Simplify right side
    20,668.70x = 385,131,400.31
  5. Step 5: Solve for x
    x = 385,131,400.31/20,668.70
  6. Step 6: Final answer
    x = 18,633.56

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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.