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Finding the Fourth Proportional to 139,840.80, 209,761.20 and 76,855.20

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Solution

The fourth proportional to 139,840.80, 209,761.20 and 76,855.20 is: 115,282.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,840.80 : 209,761.20 = 76,855.20 : x
  2. Step 2: Convert to fraction form
    139,840.80/209,761.20 = 76,855.20/x
  3. Step 3: Cross multiply
    139,840.80x = 209,761.20 × 76,855.20
  4. Step 4: Simplify right side
    139,840.80x = 16,121,238,978.24
  5. Step 5: Solve for x
    x = 16,121,238,978.24/139,840.80
  6. Step 6: Final answer
    x = 115,282.80

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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.