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Finding the Fourth Proportional to 39,692.82, 54,776.40 and 21,789.50

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Solution

The fourth proportional to 39,692.82, 54,776.40 and 21,789.50 is: 30,069.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,692.82 : 54,776.40 = 21,789.50 : x
  2. Step 2: Convert to fraction form
    39,692.82/54,776.40 = 21,789.50/x
  3. Step 3: Cross multiply
    39,692.82x = 54,776.40 × 21,789.50
  4. Step 4: Simplify right side
    39,692.82x = 1,193,550,093.92
  5. Step 5: Solve for x
    x = 1,193,550,093.92/39,692.82
  6. Step 6: Final answer
    x = 30,069.67

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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.