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Finding the Fourth Proportional to 139,027.20, 208,540.80 and 86,539.20

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Solution

The fourth proportional to 139,027.20, 208,540.80 and 86,539.20 is: 129,808.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,027.20 : 208,540.80 = 86,539.20 : x
  2. Step 2: Convert to fraction form
    139,027.20/208,540.80 = 86,539.20/x
  3. Step 3: Cross multiply
    139,027.20x = 208,540.80 × 86,539.20
  4. Step 4: Simplify right side
    139,027.20x = 18,046,953,999.36
  5. Step 5: Solve for x
    x = 18,046,953,999.36/139,027.20
  6. Step 6: Final answer
    x = 129,808.80

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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.