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Finding the Fourth Proportional to 20,350.88, 28,089.68 and 13,286.87

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Solution

The fourth proportional to 20,350.88, 28,089.68 and 13,286.87 is: 18,339.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,350.88 : 28,089.68 = 13,286.87 : x
  2. Step 2: Convert to fraction form
    20,350.88/28,089.68 = 13,286.87/x
  3. Step 3: Cross multiply
    20,350.88x = 28,089.68 × 13,286.87
  4. Step 4: Simplify right side
    20,350.88x = 373,223,719.62
  5. Step 5: Solve for x
    x = 373,223,719.62/20,350.88
  6. Step 6: Final answer
    x = 18,339.44

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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.