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Finding the Fourth Proportional to 139,071.60, 208,801.80 and 86,583.60

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Solution

The fourth proportional to 139,071.60, 208,801.80 and 86,583.60 is: 129,996.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,071.60 : 208,801.80 = 86,583.60 : x
  2. Step 2: Convert to fraction form
    139,071.60/208,801.80 = 86,583.60/x
  3. Step 3: Cross multiply
    139,071.60x = 208,801.80 × 86,583.60
  4. Step 4: Simplify right side
    139,071.60x = 18,078,811,530.48
  5. Step 5: Solve for x
    x = 18,078,811,530.48/139,071.60
  6. Step 6: Final answer
    x = 129,996.43

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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.