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Finding the Fourth Proportional to 79,857.28, 119,788 and 20,692.48

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Solution

The fourth proportional to 79,857.28, 119,788 and 20,692.48 is: 31,039.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,857.28 : 119,788 = 20,692.48 : x
  2. Step 2: Convert to fraction form
    79,857.28/119,788 = 20,692.48/x
  3. Step 3: Cross multiply
    79,857.28x = 119,788 × 20,692.48
  4. Step 4: Simplify right side
    79,857.28x = 2,478,710,794.24
  5. Step 5: Solve for x
    x = 2,478,710,794.24/79,857.28
  6. Step 6: Final answer
    x = 31,039.26

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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.