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Finding the Fourth Proportional to 20,975, 28,938.98 and 11,898.87

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Solution

The fourth proportional to 20,975, 28,938.98 and 11,898.87 is: 16,416.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975 : 28,938.98 = 11,898.87 : x
  2. Step 2: Convert to fraction form
    20,975/28,938.98 = 11,898.87/x
  3. Step 3: Cross multiply
    20,975x = 28,938.98 × 11,898.87
  4. Step 4: Simplify right side
    20,975x = 344,341,160.95
  5. Step 5: Solve for x
    x = 344,341,160.95/20,975
  6. Step 6: Final answer
    x = 16,416.74

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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.