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Finding the Fourth Proportional to 13,807.80, 20,687.40 and 11,329.20

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Solution

The fourth proportional to 13,807.80, 20,687.40 and 11,329.20 is: 16,973.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,807.80 : 20,687.40 = 11,329.20 : x
  2. Step 2: Convert to fraction form
    13,807.80/20,687.40 = 11,329.20/x
  3. Step 3: Cross multiply
    13,807.80x = 20,687.40 × 11,329.20
  4. Step 4: Simplify right side
    13,807.80x = 234,371,692.08
  5. Step 5: Solve for x
    x = 234,371,692.08/13,807.80
  6. Step 6: Final answer
    x = 16,973.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.