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Finding the Fourth Proportional to 20,635.52, 28,477.13 and 12,137.99

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Solution

The fourth proportional to 20,635.52, 28,477.13 and 12,137.99 is: 16,750.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,635.52 : 28,477.13 = 12,137.99 : x
  2. Step 2: Convert to fraction form
    20,635.52/28,477.13 = 12,137.99/x
  3. Step 3: Cross multiply
    20,635.52x = 28,477.13 × 12,137.99
  4. Step 4: Simplify right side
    20,635.52x = 345,654,916.09
  5. Step 5: Solve for x
    x = 345,654,916.09/20,635.52
  6. Step 6: Final answer
    x = 16,750.49

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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.