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Finding the Fourth Proportional to 139,239.40, 208,859.10 and 86,621.80

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Solution

The fourth proportional to 139,239.40, 208,859.10 and 86,621.80 is: 129,932.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,239.40 : 208,859.10 = 86,621.80 : x
  2. Step 2: Convert to fraction form
    139,239.40/208,859.10 = 86,621.80/x
  3. Step 3: Cross multiply
    139,239.40x = 208,859.10 × 86,621.80
  4. Step 4: Simplify right side
    139,239.40x = 18,091,751,188.38
  5. Step 5: Solve for x
    x = 18,091,751,188.38/139,239.40
  6. Step 6: Final answer
    x = 129,932.70

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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.