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Finding the Fourth Proportional to 20,791.80, 28,692.72 and 11,360.16

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Solution

The fourth proportional to 20,791.80, 28,692.72 and 11,360.16 is: 15,677.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.80 : 28,692.72 = 11,360.16 : x
  2. Step 2: Convert to fraction form
    20,791.80/28,692.72 = 11,360.16/x
  3. Step 3: Cross multiply
    20,791.80x = 28,692.72 × 11,360.16
  4. Step 4: Simplify right side
    20,791.80x = 325,953,890.04
  5. Step 5: Solve for x
    x = 325,953,890.04/20,791.80
  6. Step 6: Final answer
    x = 15,677.04

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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.