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Finding the Fourth Proportional to 128,692.76, 192,973.31 and 53,792.47

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Solution

The fourth proportional to 128,692.76, 192,973.31 and 53,792.47 is: 80,661.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,692.76 : 192,973.31 = 53,792.47 : x
  2. Step 2: Convert to fraction form
    128,692.76/192,973.31 = 53,792.47/x
  3. Step 3: Cross multiply
    128,692.76x = 192,973.31 × 53,792.47
  4. Step 4: Simplify right side
    128,692.76x = 10,380,510,988.98
  5. Step 5: Solve for x
    x = 10,380,510,988.98/128,692.76
  6. Step 6: Final answer
    x = 80,661.19

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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.