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Finding the Fourth Proportional to 139,238.40, 208,857.60 and 86,620.80

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Solution

The fourth proportional to 139,238.40, 208,857.60 and 86,620.80 is: 129,931.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,238.40 : 208,857.60 = 86,620.80 : x
  2. Step 2: Convert to fraction form
    139,238.40/208,857.60 = 86,620.80/x
  3. Step 3: Cross multiply
    139,238.40x = 208,857.60 × 86,620.80
  4. Step 4: Simplify right side
    139,238.40x = 18,091,412,398.08
  5. Step 5: Solve for x
    x = 18,091,412,398.08/139,238.40
  6. Step 6: Final answer
    x = 129,931.20

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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.