Home / 77,128.20-115,692.30-72,462.60

Finding the Fourth Proportional to 77,128.20, 115,692.30 and 72,462.60

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Solution

The fourth proportional to 77,128.20, 115,692.30 and 72,462.60 is: 108,693.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,128.20 : 115,692.30 = 72,462.60 : x
  2. Step 2: Convert to fraction form
    77,128.20/115,692.30 = 72,462.60/x
  3. Step 3: Cross multiply
    77,128.20x = 115,692.30 × 72,462.60
  4. Step 4: Simplify right side
    77,128.20x = 8,383,364,857.98
  5. Step 5: Solve for x
    x = 8,383,364,857.98/77,128.20
  6. Step 6: Final answer
    x = 108,693.90

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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.