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Finding the Fourth Proportional to 139,890.21, 209,897.28 and 73,314.42

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Solution

The fourth proportional to 139,890.21, 209,897.28 and 73,314.42 is: 110,004.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,890.21 : 209,897.28 = 73,314.42 : x
  2. Step 2: Convert to fraction form
    139,890.21/209,897.28 = 73,314.42/x
  3. Step 3: Cross multiply
    139,890.21x = 209,897.28 × 73,314.42
  4. Step 4: Simplify right side
    139,890.21x = 15,388,497,342.78
  5. Step 5: Solve for x
    x = 15,388,497,342.78/139,890.21
  6. Step 6: Final answer
    x = 110,004.10

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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.