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Finding the Fourth Proportional to 128,692.56, 192,776.04 and 66,231.84

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Solution

The fourth proportional to 128,692.56, 192,776.04 and 66,231.84 is: 99,212.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,692.56 : 192,776.04 = 66,231.84 : x
  2. Step 2: Convert to fraction form
    128,692.56/192,776.04 = 66,231.84/x
  3. Step 3: Cross multiply
    128,692.56x = 192,776.04 × 66,231.84
  4. Step 4: Simplify right side
    128,692.56x = 12,767,911,837.11
  5. Step 5: Solve for x
    x = 12,767,911,837.11/128,692.56
  6. Step 6: Final answer
    x = 99,212.51

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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.